Paying for moms college?

My mom had a dream since she was a kid to become a chiro. well she took night cles and worked during the day in order to what she needed to go to chiropractic college. Four years ago she finally made it to college to get her degree. She was only in her second week of school when the docs said that the tumor in her neck had to come out.and wanted that done that week. well thank God it was not cancer, but they still had to do a nerve graft and she was unable to move her right arm past a point. she had to give up on her dream because she was always in pain and because of the prob with the arm. to make a long story short, i ended up getting some money from an aunt who died. she gave some to me and to my sister. well i told my mom today (BTW she is 99% better and can move her arm great now) that i was going to help her go back and finish her dream. My sister is pissed off because she asked to borrow money from me (shes owes LOTS to credit card companys) i told her she got money from our