This article contains some spoilers for “All Her Fault.”

For Sarah Snook, having to leave her then-2-year-old daughter to go to work every day on the Peacock drama “All Her Fault” was, in a way, helpful for her acting process.

In the show, streaming Thursday, Snook plays Marissa Irvine, a Chicago businesswoman who goes to pick up her young son Milo from a playdate and discovers not only is she at the wrong house, but Milo was never there in the first place. The fellow mom (Dakota Fanning) she thought was picking him up from school has no idea what she’s talking about, neither does the homeowner, and Milo has gone missing.

“It was useful to kind of use my daughter,” she says in a video call. “What would it be like to have the situation happen to me? I understand that more in depth now be

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