The 49-year-old is currently behind bars charged with three counts of murder after allegedly serving death cap mushrooms in a meal at the residence.
She is also charged with five counts of attempted murder.
A person claiming to be her friend took to social media on Wednesday to ask for help after the Leongatha home was allegedly robbed.
"Need some help from the community," the post read.
"We have had a friends house broken into in Leongatha 3 times over the last month or so [sic]."
Erin Patterson is charged with three counts of murder. (HANDOUT/NINE NEWS)
The post claimed several items had been stolen including a car, televisions and vacuum cleaners.
It included several images of a person on what appeared to be the deck of Patterson's home wearing a cap and cloth over their face.
On Thursday afternoon, Victoria Police confirmed officers expect to charge a woman and a man over a burglary in Leongatha on Christmas Eve.
A red MG Sedan was allegedly stolen during the burglary, a spokesperson said.
A woman, 23, and a man, 18, from Melbourne suburb of Cheltenham were arrested in the allegedly stolen car at 1am on Thursday.
Both are expected to be charged on summons to appear at a later date.
Police allege Patterson killed her former in-laws Don and Gail Patterson, both 70, and Gail's sister Heather Wilkinson, 66.
All three died in hospital days after consuming a meal at her home on July 29.
She is also accused of attempting to murder Ms Wilkinson's husband Ian, 68, who spent close to two months in hospital critically ill.
Police will allege she attempted to murder her ex-husband Simon Patterson four times.
Erin Patterson has denied any wrongdoing.
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