"Like taking candy from a baby, you waited till the opportunity came and stole the last gift my father ever gave her. No doubt you've done this before. Disgusting."
Wallace said the standard of care at the rest home, which she did not want to name, had been "outstanding".
She said that the theft had resulted in unfair suspicion being cast on honest staff.
"What annoys me most are two things: that honest, hard-working caregivers who do a job not many are suited for are being tarnished by this one act of dishonesty.
"[And] that elderly people, particularly the ones who are unwell, are as vulnerable as children and there are creeps just waiting to take advantage of them."
Wallace contacted Sideswipe columnist Ana Samways to send a blunt message to the thief.
"I wanted to send a personal and public message to this person that they are the lowest of the low," she said.
"Whoever the culprit is, they have to look at themselves in the mirror."
Last year Wallace hit the headlines when she held a garage sale at Mrs Hooper's $4.7 million home in Paritai Drive.
Sale items included imported tableware, a baby grand piano, ornaments, crystal and silverware, paintings, American costume jewellery and vintage clothing and hats.