Well, she's got a lot of folks jockeying to kill her. For some reason. Apparently despite Mystra dying being pretty bad for basically everyone, including the Evil gods, they keep trying......Mystra/Mystryl/Midnight/the-Goddess-formerly-known-as-<arcane symbol> seems to die an awful lot.
I think most of the deaths here were retconned to be "just as planned" because the Weave becomes unstable over time unless Mystra reincarnates every once in awhile, often causing many thousands of innocents to die in the upheaval from magic failing across the realms. That's some powerful Neutral Goodness, right there.