Australian actress Eliza Szonert, who grabbed her young son from her former partner at a restaurant, is reportedly being held in custody by Malaysian police.

The former Neighbours star, 41, remains in custody but has not been arrested, her mother Kay has claimed.

The actress' mother - who is currently caring for her grandson - said her daughter believes she will be interviewed by police over the December 10 incident but does not know when it will happen.

She also told the Sydney Morning Herald that her daughter is currently ill and suffering from bronchitis.

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Malaysian police are reportedly investigating Australian actress Eliza Szonert who grabbed her young son from her former partner at a restaurant

It comes after a video emerged of the moment Ms Szonert snatched her son back from her estranged partner, Australian musician and businessman Ashley Crick.

Kuala Lumpur police deputy chief Datuk Law Hong Soon said Mr Crick had filed a police report on what happened earlier that day, local news site The Rakyat Post reported.

'I think this case is more towards a family conflict. The police will seek Szonert to record her statement,' he told the publication.

The high profile pair have allegedly been in a bitter custody battle while staying in Kuala Lumpur.

Ms Szonert told Fairfax Media she took her son to Kuala Lumpur to visit his father but the arrangement allegedly didn't go to plan.

She was allegedly forced to leave their shared accommodation without their son or passport following a dispute.

Daily Mail Australia revealed that the star had spent eight weeks in an expensive drug rehabilitation clinic in Thailand before she dramatically snatched her son back.

The former starlet sought help at the high-end rehab centre The Cabin Chiang Mai, a popular facility among celebrities and corporate types known as the 'Betty Ford of South-East Asia'.

Actress Eliza Szonert, 41, was reunited with her son after being helped by a child recovery agency in Malaysia. They were separated after she took him to visit his father Ashley Crick who reportedly locked her out of his apartment

The footage shows two large men who accompanied Ms Szonert speaking with Mr Crick at the restaurant

Ms Szonert, 41, attended drug counselling and claimed to have seen former AFL star Ben Cousins - who has battled addiction to methamphetamine for years - at the facility.

But the actress has now denied these claims, saying that she sought treatment for depression.

'Ashley has made some outrageous accusations about me, which I totally deny,' Ms Szonert told New Idea.

'I sought treatment for depression, which was a result of relentless intimidation by my former partners.

'Over a number of years this had worn me down, and by October I'd become so utterly broken emotionally that I sought refuge in rehab to rebuild my confidence and spirit.'

Ms Szonert was flanked by two burly men when she went to retrieve her son from a restaurant in the Malaysian capital's Mid Valley Mega Mall with the assistance of a leading child recovery agency.

Video footage of the recovery supplied to Daily Mail Australia shows Ms Szonert arriving at the restaurant accompanied by two men who distract Mr Crick.

Video shows the moment Eliza Szonert, 41, arrived at a restaurant in Malaysia flanked by two burly men to grab her young son from former partner, Australian musician and businessman Ashley Crick

The footage then shows Ms Szonert retrieve her son in the incident on Thursday morning.

A second video supplied to Daily Mail Australia then shows Ms Szonert and her son joyfully return from the restaurant in a car.

She said in the second video that she is 'feeling adrenaline and relieved - I'm crying.'

The footage shows her and her son hugging.

A spokesperson from the child recovery agency, which asked not to be identified for security reasons, told Daily Mail Australia that Australian government authorities are now refusing to reissue a passport for the son.

The High Commissioner had allegedly refused to reissue a passport because a passport already exists and the incident is a 'civil custody matter'.

Ms Szonert has allegedly been told by authorities that she must negotiate a resolution with Mr Crick.

The child recovery agency spokesperson said the son's visa for Malaysia is also due to expire soon.

The footage then shows Ms Szonert retrieve her son in the incident on December 10

Ms Szonert and Mr Crick are believed to have shared custody of their son.

Daily Mail Australia understands the actress had been in Kuala Lumpur since August after accompanying Mr Crick and their son on a flight from Australia.

The three then flew to Koh Samui in Thailand for a holiday.

During this time, Ms Szonert made a booking at The Cabin and stayed behind in Chiang Mai while Mr Crick and his son returned to Kuala Lumpur, where he works as an executive at a video streaming business similar to Netflix

Ms Szonert was in the facility for at least eight weeks between August 21 and October 25, 2015.

The facility charges up to $14,000 a month and Ms Szonert told friends and family she had made great progress during her time there.

While she was at The Cabin, Mr Crick enrolled his son in a local school and was in regular contact with his former partner.

After completing rehab, she flew back to Kuala Lumpur to stay with Mr Crick and their son at his three-bedroom house.

Ms Szonert has refused to respond to questions from Daily Mail Australia about her time in rehabilitation in the months leading up to the bitter confrontation.

Mr Crick also declined to be interviewed for this story but said: 'The only priority is the safety of my son.'

It had earlier been reported that Malaysia is not a signatory of the Hague Convention on the Civil Aspects of International Child Abduction.

It is understood Mr Crick, an accomplished sky-diver, relocated to Malaysia to roll out an online video platform similar to Netflix.

Ms Szonert made a name for herself as an actress after appearing in the Australian drama Neighbours between 1993 and 1993, and has since played Trish Moran in the film The Dish.

Ms Szonert reportedly travelled to Kuala Lumpur with her son earlier this month to visit her former partner of four years and father of her child, Australian businessman Ashley Crick (pictured right)

Ms Szonert made a name for herself as an actress after appearing in the Australian drama Neighbours and has since played Trish Moran in the film The Dish