Awww that poor lady. It is a very nice gesture on her part but I can see how awkward it would be for you!
I can't imagine how it feels to be in her shoes. You may want to say something to the effect that you will treasure her gifts and that you fully expect her to be around for a long time ahead. (maybe in a light-hearted but meaningful tone)
EDIT- I love the post about calling her, if you are able. She may be very scared and depressed.