Why didn't Anna's band members see her mom performing the solo?
She was standing just off to the side, so the audience couldn't see her, but I'm positive you can see her friend Maddie looking right at "Tess" playing the solo, but none of them say anything. I would think they would have found it strange and said something.
Jean Grey could have lived to become a god, but it was more important to her she die... a human.