A MOTHER has told a national inquiry it is unacceptable for her teenage brain injured daughter to be living in an aged care facility.

The Senate inquiry investigating the needs of young Australians living with a disability is holding hearings in Western Australia.

Inquiry chairwoman, Greens senator Rachel Siewert, told the hearing more than 3000 Australians under the age of 60 were living in aged care homes that do not suit their needs.

Kirstine Bruce said her 18-year-old daughter Ariana Pila was living in a facility where her daily life was dictated by the routine and requirements of the elderly.

"It's hard going into that place, seeing how they look after them, how they just get her up, put her in a wheelchair and then put her in front of a TV," she said.

"They get her up between 10 and 12, they put her into her wheelchair and then she's placed in front of the TV for up to four hours, and then put back to bed between two and three, and that's her daily routine.

"It's not appropriate for young adults."

Ms Bruce said she and her family of six had to move to Perth from Geraldton after Ariana was admitted to Royal Perth Hospital in April, 2013, with a rare disease, anti-NMDA receptor encephalitis.

The disease occurs when the body's own immune system attacks the brain's receptors.