Perhaps some cards, envelopes and stamps and offer to write any messages, or help her to, on her behalf. When I was in hospital for long spells, I became very anxious to acknowledge the gifts and good deeds that were done for me and my family. A friend who understands me helped me by bringing in pretty cards. I wrote brief messages and she did the addresses and posted them. It felt like a weight off my mind. Really, just ask your friend if there are things like this you can do for her?