Daughter of Steel

Abigail Lensherr is vicious. She may have big green eyes, thick sooty lashes, and a smile that could melt butter, but don't let that fool you; she's a powerful mutant. After all, she is Magneto's daughter.

When her father is taken to prison for his crimes, she is sent to the only place where she will be safe: Charles Xavier's School for Gifted Youngsters.

This is set at a point where Charles and Eric are young, but the school is more popular than it is in Days of Future Past.