Hi B.,
It looks like you have gotten great advice already, but thought I'd share my experiences!
When I had cancer, I greatly appreciated the cards that were sent with hand written notes. I kept them out around the house as a nice reminder of how many people cared.
I also LOVE flowers and whenever I got flowers, they brightened up the home for me.
Having prepared food is also a tremendous help. She will be tired and her husband is going to have a lot on his hands taking care of their baby. If you could prepare some food that they could freeze and take out when needed or send a care package, I know that would be of great help.
I don't know if your friend is going to be away from her baby, but I had to be away from my son because of the type of radiation I had(when he was 7 months old) and a good friend lent us a web cam.I can't begin to put into words what that meant for me to have my daily "conference calls" with my husband and son while I was away from them.
Also, cancer can go on for a long time- keep up the correspondence with her- even if it's one sided. Sometimes I was tired to get back to people, but it meant the world to me that people kept reaching out.
I will keep your friend in my prayers.
N.