Family members say the Gold Coast girl, 4, is battling to recover in hospital.
Her mother is accused of feeding the cancer drugs to the girl for 10 months.
Supporters have sent messages and photographs wishing her well, to a new Facebook recovery page, which has been “liked” by almost 2000 people.
A couple from Cornwall in the UK photographed themselves holding a “get well soon” poster and there were other messages from North Carolina and Utah in the US.
A condition update on the site, believed to have come from a relative, said the girl was facing an uphill battle to recover.
“she is responding well, but a long rd ahead before she out of the woods (sic),” the hastily composed update says.
The page’s organiser added: “Well done (little girl), someone above is listening to all those prayers and well wishes.”
Her grandmother has said the girl is a “fighter”, but declined to comment on her progress yesterday.
The girl’s mother, 22, was arrested and charged with grievous bodily harm earlier this month and did not apply for bail when she appeared in Brisbane Magistrates Court.
She had set up a Facebook page for her daughter that was followed by thousands of people before her arrest.
The Courier-Mail last week revealed the mum had previously claimed online that she herself had colon cancer, anorexia and cluster headaches.
In a separate case, a mother-of-three who injured her baby son for more than a year was jailed for five years in the Brisbane District Court in 2010.
The court was told a psychiatrist found the convicted mother had the symptoms of Munchausen syndrome by proxy.
Munchausen syndrome is a disorder in which a person fakes illnesses to gain attention or sympathy.
The related Munchausen syndrome by proxy involves a person harming someone else for attention or sympathy.
In the latest shocking case, police will allege the mother obtained the chemotherapy drugs online and gave them to her daughter at home and in hospital while doctors sought a diagnosis.
A spokesman for the Royal Children’s Hospital – where she has been treated – said he was unable to provide any details about the girl’s condition.
Source: news.com.au