Chaos Magic is bad for wonda.
I think hope wants to turn Wanda back into a mutant because she knows that Wanda is a mutant.
After all if Wanda wasn't a mutant how come Hope could mimic her powers back during the AvX event? Though, whoever did try to kill her, must have intentions on putting greater purpose on her. Hopefully this means that Wanda has her actual life back and is actually a mutant again. Though. If that's the case, then the same could be said about Pietro if the killer is actually after him as well. Anyway, whatever the killer's intentions are, it is Definitely for a greater purpose.