The daughter of a resident at a Western Sydney aged care facility at the centre of a coronavirus outbreak says her mother is in a game of "Russian Roulette".

Key points: Three residents at Newmarch House have died from coronavirus

Louise Payne tried to get her mother out of the facility before the lockdown

The nursing home's management says it's "in the eye of a storm"

Louise Payne believes her 89-year-old mother Yvonne, who has tested positive for coronavirus, is in more danger at Anglicare's Newmarch House aged-care facility than she would have been at home.

Three residents have died at the facility in Caddens, which has been the centre of a COVID-19 cluster after a staff member worked for six days despite having mild symptoms of the virus.

Forty-one residents and staff at the facility have tested positive for coronavirus.

Ms Payne is concerned her mother is at risk of dying as she has dementia and diabetes.

"It's like Russian Roulette … I can't say mum's got a better chance than anyone else there (Newmarch House)," she said.

Before the coronavirus lockdown, Ms Payne asked about taking her mother out of Newmarch House until the pandemic had passed.

She was told that was not possible.

Ms Payne was later left shocked when contacted by Newmarch House about her mother's condition.

"I received a call from one of the nurses and the first thing she said was I needed to complete an updated advanced care plan in case mum deteriorated," she said.

"I was just stunned … and I asked the nurse, 'are you ringing and asking me this because mum's got COVID-19?'"

Newmarch House confirmed her mother had COVID-19.

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Ms Payne told the ABC she opted to use palliative care for her mother, rather than a respirator, if her condition deteriorated.

She has not been able to visit the facility since it was placed in lockdown on March 23.

Anglicare CEO Grant Millard said Newmarch House was "in the eye of a storm".

"Everyone is struggling to find staff for us, including the Commonwealth Government and eight agencies," he said.

"We are deeply sorry for the effect that it has had on some of the people we look after and that they have had to wait for the care they deserve during this crisis."

Gregory Crawford, President of the Australasian Chapter of Palliative Medicine, said people need to have a conversation about what they want when they're facing the end of their lives.

"Conversations [about dying] are really important in our society and shouldn't just be [about] COVID-19, but this is a really critical time to open those conversations and discuss them," he said.

Palliative medicine physician, Meera Agar, said communication with family members was critical when their loved ones had a life-threatening illness.

"When deterioration occurs from any illness … over a short period of time … people feel they need that information and understanding of how things are changing and what the new plans are."