Xavier wanted co-existence with the humans, while Amelia thought it was best for mutants to stay underground. When Xavier brought Scott Summers to his mansion for training, Amelia left him, telling him that his plans for the X-Men would doom all mutants.
Xavier and Amelia had differing views on how mutants should interact with humans. When Xavier brought Scott Summers to his mansion for training, Amelia left him, expressing her belief that Xavier's plans were harmful to mutants.