Tad, Maybe she brags because she wants to feel important in the eyes of others? She's the only one that can you why she does this.
As for asking about her hospital visit and your brother dying, well, it could be she's updating her medical history and she connects the two events as being around the same time frame.
Tad, wondering why she says and does things is going to drive you nuts. Mlcer do this crazy sh@t all of the time and there is no rhyme or reason to it. You aren't dealing w/someone who has a full deck of cards right now. Just let this kind of crazymaking behavior go. The journey is all about her...not you. You may never know why she asks certain questions and again it's all part of the mlc journey.
Keep the focus on YOU!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.