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 wished for peaceful co-existence with humans, but Amelia thought mutants should stay underground.  When Xavier took Scott Summers to his home for training, Amelia departed, warning him that his plan for the X-Men would result in the demise of all mutants.