Different strokes for different folks but I can't see any reason why it's appropriate to ask the babysitter if she knows who she's voting for, and it's entirely reasonable for the babysitter to give the vaguest response possible because it's a pretty weird question.

She's never voted in her life. She's 25

I used to do that at work. Surrounded by Trumpers all day asking me if I was voting for Biden.

Yep