Thanks. But I don't think the Sentinels killed her. It had to be Trask's people, torturing her, dissecting her until they found all that they needed to know from her genes.
No. I am not sure the Sentinels would killed her if she regain her powers or she worked with guards to try and help the mutants. She was alive in the other movies. She was shot with the "cure" in X-Men: The Last Stand. The Sentinels don't attack if they can't sense the mutant gene that's how Young Hank in the police care tricked it.
I guess everyone one forgets about the other X-Men films the first one, the second and third one.
When Mystique was captured after killing Bolivar Trask she escaped or was rescued she because was in X-Men, X-Men 2 and X-Men 3 which happen after Trask death but take place before for the Sentinel attack in the future.
The original timeline where the Sentinels created happens after the mutant cure is made and when Jean Grey becomes the Phoenix. Mystique is shoot with the cure saving Magneto in the third film the same film where Jean and Scott die. They are not in the future timeline so that means Mystique is a human in future timeline.
But like I said I don't think anyone remembers about number one, two and three.
Maybe because of the aftermath of the third film, everything deviates. Or time before the first film deviated from the norm. Somehow, Mystique was captured and experimented on, and then she escaped, but Trask already had all that they needed from Mystique's DNA to create the Sentinels.