The 45-year-old woman admitted 11 charges when she appeared in Adelaide Magistrates Court on Thursday.
The woman, from the western suburb of West Lakes, was arrested last December and accused of faking her son's cancer to secure $60,000 in donations from the community.
Prosecutors had alleged that she had been requesting donations through an online fundraising page and the child's school, after putting her son in a wheelchair with bandages to imitate radiotherapy treatment.
In May, all charges against the woman's husband were dropped and her charges were amended to one count of criminal neglect, 56 counts of deception to obtain a benefit and 14 counts of dishonestly dealing with property.
On Thursday, prosecutors told the court the case had been resolved after plea bargain negotiations.
The woman, who appeared in court via video link from the Adelaide Women's Prison, admitted 10 charges of deception to obtain a benefit, totalling $11,500, for amounts ranging from $500 to $3000, between November 21 and December 12, 2024.
The criminal neglect charge did not proceed and the woman instead pleaded guilty to one aggravated count of acts likely to cause harm to a person aged under 12.
When police revealed the allegations last year, acting Assistant Commissioner John DeCandia said he "couldn't think of a more devious and cruel scheme".
"It's abhorrent that (a person) would seek to profit for their own personal greed and selfishness from such an insidious condition such as cancer which impacts so many families in our community," he said.
Magistrate Patrick Hill remanded the woman in custody to face the District Court on November 28, when a date for sentencing submissions is expected to be set.
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