Barbara,
It's important in a situation like this to CYA and follow the right procedure. Still send her late payment notices and document everything. While as humans we want to give her benefit of the doubt, it sounds like there is a lot of tangible events that constantly went wrong. Some states also require that after the eviction or move-out you keep their personal property for a set number of days. It's best in this situation to stick to the legal script just in case it backfires.
There was a podcast episode that covered something very similar, can't remember the number or guest but it was a few years back. Anyways, the tenant was in the hospital and couldn't pay rent. It turned out to be a fabricated story I believe and his advice in that situation was treat it like any other eviction. Which included sending the late payment notices on-time and eventually the eviction notice.
Hope this helps, and hoping for the best in this situation.