A glamorous bookkeeper who pocketed more than $330,000 from the autism charity she worked at has pleaded guilty to the despicable theft.

Marissa Jade Esposito, 22, fronted Gosford Local Court on Thursday, where she pleaded guilty to two counts of obtaining financial advantage by deception.

She claimed she stole $16,000 while working at Autism Central Coast in 2017, but it was later revealed she pocketed $327,539.57, The Daily Telegraph reported.

Marissa Jade Esposito, 22 (pictured), fronted Gosford Local Court on Thursday, where she pleaded guilty to two counts of obtaining financial advantage by deception

Autism Central Coast CEO Rosa Trigg (pictured) said she hired Esposito, who was her son's friend, as an accounts and admin clerk in 2017

The 22-year-old also managed to squirrel away an additional $3415.76 from Out of The Box Family Daycare - the daycare arm of the organisation, the court heard.

Speaking to A Current Affair, Autism Central Coast CEO Rosa Trigg said she hired Esposito, who was her son's friend, as an accounts and admin clerk in 2017.

'She asked me if I had a job because she knew I was starting up and Autism Central Coast was getting a little bit bigger, and she said she had some accounting (skills), Ms Trigg said.'

Esposito was also the only full-time employee at the charity.

But instead of processing payments for both of the organisations, Esposito put through bogus payments listed for legitimate payees over a 10-month period.

It was only after she went on maternity leave in August 2018 that Esposito was found out, after a new bookkeeper found discrepancies in both organisations' accounts.

According to the charity's MYOB software, it was supposed to have $1.2million in the bank, but in actual fact there was only $220,000, the publication reported.

Ms Trigg told ACA that the missing money was to pay workers' super, it's actually our tax, it's actually our insurances.

Ms Esposito's (pictured) offending wasn't revealed until she went on maternity leave

Esposito (pictured) siphoned money that was supposed to pay superannuation and insurance

The CEO said Esposito eventually called her on January 24 to fess up to pilfering funds, saying 'I have something to tell you and you’re going to hate me'.

She told the CEO she took money after some Asians allegedly showed up at her door and demanded she pay an amount or her child would be killed, police facts stated.

Ms Trigg told ACA the 22-year-old initially claimed to have only stolen $16,000, despite the CEO repeatedly asking her if she stole more money.

'I asked her three times in her unit: "have you taken any more money during the period of the time I was there?"

While police are yet to confirm how the money was spent, Esposito (pictured) reportedly told detectives she had been gambling

'She said no I wouldn't do that - I'm so ashamed, I feel horrible,' the CEO said.

On January 28, Esposito paid back $6000 and the next day her partner Chris Alipate offered to pay a further $10,000, which was transferred into the charity's account.

It is not suggested that Mr Alipate was in any way involved in the theft.

However, the charity notified police after Ms Trigg received a text from Esposito, which stated the 'situation' had been going on for much longer than she admitted.

'That account belongs to me and I am so sorry Rosa I wanted to tell you everything but I was scared,' the text message stated.

Esposito's guilty plea comes after the charity successfully lodged a civil application in the Supreme Court to freeze her assets.

While police are yet to confirm how the money was spent, Esposito reportedly told detectives she had been gambling.

The 22-year-old will be sentenced on May 2.