I just went thru this last year - from May - December. Meals are a HUGE help. She has three boys so I even took snacks, etc. a few times just to help with that. I sent cards, I sent her motivational and inspirational stuff, books.....not just about dealing with breast cancer but things like PURPOSE DRIVEN LIFE that help her see the whole picture.
She JUST told me on Friday that despite how hard it was, it was the best thing that happened to her and now she realizes that everything has a purpose. She KNOWS she's become a better & stronger person thru the struggle.
I called her EVERYDAY from the time I knew she was going for a biopsy (BEFORE we knew she had cancer) thru chemo. Even if I didn't talk to her, I'd leave a message telling her I was thinking of her & make sure & let me know if there was anything I could do to help and that she DIDNT have to call me back.
I'd drop by sometimes. A couple of times, she was in pretty bad shape and wasn't up for company but I asked if there was anything I could do for her....laundry, etc. Didn't stay long during those couple of times but she has told me REPEATEDLY how much all of that meant to her.
DO NOT WORRY ABOUT WHAT TO SAY. It's MUCH more important that you're there for her. Maybe she needs you to LISTEN rather than talk. They need to vent and need perspective when the hair starts falling out, etc. Just be more concerned about being there.