I am really puzzled about a widowed friend

And I don't know how to react. She was widowed last August . Her husband had been in poor health for a long time. Since the funeral she has been very busy, obviously with the paper work and sorting out the house removing his stuff and all the things involved with illness. When we meet she never stops talking. She never asks about anyone else who is there or how they or their family are. She is out and about every day and it's as if schools out! Is this a normal stage in bereavement? I was with her and other friends recently, two of whom had had quite significant events in their lives which she knew about and even though I asked them in turn she interrupted with her monologue about her grandchildren and her visits out and her holiday. Totally no interest in the others there. It just seemed so strange and self centred and anti social. I am interested to know if this is a phase or a stage in old age- she is over 80 and I have known her for twenty odd years.