Bring home a nice little cake and some gifts maybe have the family over
You don't want to over do it. let's think about it. the party is really for the adults. A one year old won't remember this party so i think just get a cake and some toys and let them have fun
If you want to do a little spoiling just get her the tennis shoes. She won't know any difference. Maybe you could do some babysitting for free to help the mom. Peace
It depends how close you are to the family. I would suggest any where from $25 to $50. Also there is no monetary standard any more. You give what you can afford to give. People will understand than everybody is in different financial situations.