I mean why not, but 10-15 BTC is quite an amount actually.
If you live in my country, you're almost like giving millions to someone.
Maybe you could tone that amount a bit, but again it still depends on you because in reality I would not give that high of an amount.

There is still a part that you still helped yourself that she was able to help you when you were young. I wonder how big that help was though, OP.