There are lots of lovely things you could do, but a lot of it depends on personal taste.I personally think you can't go wrong with a 'Thinking of you' card.. If you wanted to get a gift there are beareavement guardian angels, flowers, a charm or locket, you could make a small donation to a charity in her daughter's name.. I am sure your friend will be touched that you remember her little girl and I am sure she will appreciate whatever you decide to do. Good luck.