My mother has Uterine Cancer

I'm sorry I can't relate to most of you who have cancer but I have already lost my Uncle to cancer and now my mom has it. She's 73 and has had a hard life. She starts Chemo on Friday and she doesn't know how bad it is. I'm 22 the youngest of 5 and I'm scared to death of losing her and don't know who to turn to. Any advice would be so helpful.