M.C.
I agree with a previous poster, I think she's just trying to be polite because she's scared of losing her position in this economy. It's very nice of her to offer but being that I've been in several positions to find either daycare, a nanny or sitter, bringing their child(ren) along is commonplace and they usually expect the same pay regardless. So I'm also going to say, unless you feel she won't provide the same care, then don't change it. You're lucky you have a nanny who's so kind about something like this but if she's good to you, be good to her and let her keep her pay. Especially because of the fact that she's taking on a huge financial responsibility with having a baby, she'll need it more than ever. Plus as her baby gets older, it's a playmate for your child. So everyone wins actually.