Hey Ann: My 83 year old mother was diagnosed last month with Adenocarcinoma lung cancer. Just like you I hit the Internet searching for everything I could find on the subject. Maybe that was a mistake. She's decided to give chemo/radiation a try. She is otherwise in very good physical condition for her age ( other than osteoarthritis and glaucoma). Hopefully these treatments will be of some benefit to her.
Good luck to you and your mum.