I'm sorry but this is just so off. Because she had learned to control her powers. And with most of her powers coming from Chthon, there's nothing that Xavier could do to help with that. Wanda doesn't need another story that pretends retconned stuff makes the past worse. They already tried that with the Avengers, making it seem like they should have always known. Wanda needs a hard reboot. Keep her on Avengers, closer to the movie stuff.
Oh yes it is, because it doesn't take into account that she was taught magic thoroughly by Agatha and even took on her own apprentice.