How old is the Aunt? Stage 4 is pretty advanced isn't it?
The Aunt said she wanted people to stop calling her - I'm taking that as she didn't want people calling her about her illness. Why not a call about thanking her for the items.
I also think a followup separate Thank You handwritten note is a good idea - separate of the Christmas card mailing. I agree with elaborating a bit on the items. They were important to her and she wanted to give them to someone who SHE thought would appreciate them.
If you think there's any time she (or a relative) may drop by - have the items out where they can be seen.