An Australian media contingent's waiting outside a police station in a small Victorian town - hoping a woman at the centre of a fatal mushroom lunch will emerge.

Erin Patterson's being questioned and her Leongatha home is being searched after her arrest this morning.

Three people died in July after eating a meal she prepared in July.

Australian correspondent Andrew McFarlane says Patterson's previously said she bought mushrooms for the dish at a store.

"She says she actually ate the beef wellington in this case and she felt sick and went to hospital- but she also says her two kids, who were at the movie theatre when this meal took place, ate the meal the next day, but they scraped the mushrooms off and they were fine."

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