She killed herself in a masterful ploy to kill Negan via zombie bite, and she came pretty close to accomplishing her goal.
I’m just sad that she died before she could see Shiva in action.
It was a tragedy to watch her as a Walker after everything she had survived, but at least she went out on her own terms.
Of course, Scott Gimple’s statements that Sonequa Martin-Green could totally tackle both Star Trek Discovery and The Walking Dead ring a bit hollow now that we’ve seen the end of Season 7, which also happened to feature the end of Sasha.