A mutant with the ability to turn her body into mist, Amelia was a love interest of Professor X before he founded the X-Men.

Stationed in Tibet, Amelia was glad to see another American and her positive and friendly attitude helped Xavier to get over the depression he developed when his legs were injured.

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.

As one of the older and more experienced mutants, she was given a position of seniority within the group, even though she didn't agree with some of the Acolytes' more extreme policies, like the killing of humans, though initially she advocated it in the case of Moira MacTaggert.

[3] She eventually became disillusioned with the Acolytes' extremist stance and left the group, ending her services assisting Magneto with his rule on Genosha by working against him to help the X-Men free the captured Professor X.

[4] Amelia returned to work as a nurse and is also one of a handful of mutants to retain their powers following the events of M-Day.

She also informs Omega Sentinel of recent events that took place after she returns to normal following her possession by Malice.