Do you have time to put together a basket? A gift basket for a night in might be nice: blanket, popcorn, Blockbuster gift card, bubble bath, easy listening music, etc.
Maybe a little figurine? I don't collect anything, but there's probably an appropriate Hallmark one for a caregiver? Something that she'll think of your child when she sees it, but not necessarily a framed picture for her mantel.
A little picture of your child would be nice for a Christmas ornament, though, if you want to make one.
I appreciate gift cards for birthdays and holidays, but this is a little different occasion. Best wishes.