Hi, This is the first time at this site and read your message. First I want to say your sister will get through this. I was diagnosed with stage colon cancer also lynch. It is important for your sister to get gene tested, her child has a 50% chance of getting this as well. I have been cancer free for 2 years, I had surgery and chemo, she should definately go for chemo. Yes its is very scary, and hard and she will need all the help she can get. She is alive and lucky enough to have caught it early. I did not lose all my hair, but it did thin, I did lose alot of it, but I still had a full head of hair, and it grows back. As for yourself if you have not already been told so it is heritary you should get checked as well. When I was diagnosed no one in my family had cancer, so I was the first one to get it.
Hang in there, she and her family will get through.