Donating one's hair to make wigs for children with cancer

Q: I am a female in need of advice about the cutting of hair in terms of disposal. I cut my hair on Friday and someone mentioned this foundation to me where you can donate your hair and they make wigs for children with cancer to use. Now my mum says she's not sure if it's a good idea because Islamically you must bury your hair and I agree with that. However, I really just want to make a difference for a cancer-suffering child and of course I won't do it if it's wrong. My question is: Is it wrong to donate your hair for cancer patients?

Befriending kuffaar

Q: I have a best friend whom I hurt very badly because of a male friend. She feels hurt and we don't have the same relationship which we used to have before. She is also a non Muslim. What should I do? Even if I try to sort it out I don't think she will forgive me. Should I leave it or sort it out? What is the solution according to Islam? Please help me out.