My thought is what if Wanda upon her return... is a bit "changed" she watched her family die, her home city destroyed, her brother, she was manipulated by ultron, she was forced to kill her love, and then died herself. it would not be a shock to say upon her return that she may be a bit "Stressed"
I'd have upon everyone's return bring Pietro back, and her teammates show concern for he was not one of the ones killed via the infinity gauntlet, and no other lives returned from past deaths. Doctor Strange believes Wanda's connection with the Infinity Stones willed him back. They take them both under observation. Hank recommends an old friend of his look at them, a Moira McTaggert. Moira says she's seen there genetics before, it's rare, but her old College and flame Charles Xavier would answer all their questions. It's revealed that Mutants do exist and have for decades, but very few in numbers, so few that the "normal" looking ones can hide in plain site, those who are exposed just have people chalk it all up to "science experiments" (like Whizzer in Jessica Jones, Jessica herself, Luke Cage, Spider-Man, Cloak and Dagger, etc.. its becoming more common) and those who look abormal have just become "tabloid fodder" equal to "alligators in the sewers" The Mutant Gene is what kept them alive during Struckers experiments and why they were the only survivors. It's also later revealed that another Mutant and college of Xavier, Erik is indeed their father. (they'd have to explain some day how/why he hasn't aged much since WWII though) Magneto used Mastermind to erase their memories and implant new ones, hoping to give them a better life (id say years before Age Of Ultron Magneto did something terrible, and Wanda and Pietro were mortified... and to ease them, Erik used Mastermind to erase everything and implant memories of their parents and parents. All of this would cause Wanda to go into full on meltdown mode... and rather than saying "no more mutants" she does the opposite. The mutant Gene is suddenly unlocked.. people who would never be mutants but carry the gene (Which wouldn't be activated for generations) now are suddenly becoming mutants... its random, but it would be fairly similar to the "potential slayers" in Buffy becoming full on Slayers. This major jump in evolution would create panic and fear among-st the human race, and also the influx would cause Charles to expand on his school. I'd also wager that the public would be very fearful of Wanda.. which would splinter Xavier and Magneto's relationship and Magneto would create the brotherhood
wanda's further story arch down the line would have her defy her father once again and go back to being a hero under the guidance of Doctor Strange and honing in on her abilities.
