In my point of view it would really depend on how she will take it, what I mean about that is she a person that needs the monetary assistance your Bitcoin will give or will she be more appreciative on receiving gifts that aren't exactly money? Because when you think about it when you say a "gift" you are looking at items and not money, on the other hand if we are talking about money you will always think about it as a donation and not as a gift. At least take this into consideration first if she needs the money or not as she might like having real gifts rather than money from you.