@greggkj I would not have asked. You basically invited your daughter. The mother was gracious and didn't make it a big deal, but it could have been super awkward for financial or any other reason. I wouldn't do it again especially as kids get older.
@gigatt18 Yep, offer to babysit. Or a coffee gift card. If budget allows, offer to babysit while she uses a gift card for a Mani Pedi if that's her thing.