Sorry for your loss...
but you can't beat yourself up over some of those things. A friend of mine committed suicide after we were out of high school. From grades 6-8, we were inseperable; we were like brothers. Once we got to high school, he went down a different path than I did, so we grew apart. We were always friendly to one another, but were never as close as we were in jr. high.
After I went to college (he never went, never got a license, just sorta drifted) I ran into him at Applebees. We talked and talked about IU basketball, as we were both avid fans and always had been. He mentioned that we should get together and watch an upcoming game that season. Of course, I said that sounded like a great idea and that I would call him. Well, I never did. Not long after that, he committed suicide. I remember the day my mom told me. Of course, I wondered at the time, what if? What if I had made that call?
Now that I look back, I doubt it would have made a difference. He had so many problems that I highly doubt that getting together to watch a game would have changed things, but I will always have that in the back of my mind.
Hang in there! She sounds like she was an incredible woman.