DD1 is at pre-school with a little girl who we don't know particularly well, and I don't really know the mother. She was invited and came to DD party. She's now kindly invited DD to her party but we can't make it. If we were going we would bring a present (as she did for my DD), but if we can't come would you still give a gift? Is there an etiquette on this? I don't mind getting her something at all, but don't want to seem OTT.