Babysitting dilemma

I don’t think I would be comfortable with it. What if her husband asks you questions will you have to lie for her too? Better she sorts out her marriage situation first surely.
Not an easy dilemma though.

thank you for taking the time to respond , that was my reaction, but you know when you doubt yourself, especially when faced with a very emotional and upset d

I would babysit, and I would lie for her. Wrong, I know, but my loyalty would be to my daughter.

Sorry, but I would be suggesting that your daughter doesn't embroil you in her deceit. I would not condone any of my children cheating and whilst sympathetic towards a failing marriage I would be urging her to either knock the affair on the head and work on the marriage or to accept that it's over and tell the husband there's another man.
Either way there is a role for you as a sympathetic listening ear, but I suspect it's not going to be easy.

I would do it. But I'd also suggest to her that cheating isn't going to make her unhappiness go away , and that she'd be better off either fixing her marriage or leaving. But in the meantime, yes I'd do it.