What to do?

Even though DH was being a total douche yesterday, he still managed to do something nice. He got my friend's ( the one that I just found out had cervical cancer and hadn't talked to in months) phone number and address for me. Now I just have to figure out what to do with it. Should I call her? Should I write her a letter? If I write her a letter should I even try to mention the topic of why I'm mad at her? I can't just write something saying "get well soon". I'm sure she's now expecting something from me since DH got the info from her. I just don't know where to start...