Me? an Avenger?

She never had a normal life, for as long as she could remember she was a weapon of war, one to be feared by all countries with the alias of 'Aries' with Ms Marvel gone, who was to save her from her 'carers'... or was she. The girl had no family, no friends, not even a name other than her alias and test subject x95 when in the lab, she hadn't ever seen the outside world either other than the bloodied battlefields. Until one day when the MSs (mad scientists) in charge of her 'care' made a crucial mistake which gave her the chance of freedom.
3 years later the fury presents the avengers with a report about a strange 17-year-old teenage girl traveling around Australia stealing essentials from stores and mugging people, seems a bit mundane for S.H.I.E.L.D doesn't it? Well not in this case. According to the reports, each time police tried to catch her they would wake up the next second at the station they worked in (usually with no money and permanent marker on their faces but they don't need to know that), when they did manage to corner her a wave of energy would erupt from her body and destroy the surrounding area rendering electronics useless within a 5 km radius. Not only that but she was seen silently assisting the avengers with the alien invasion lead by Loki and when the flying donut (as Tony (iron man) and Peter (spider man) like to refer to it as) landed on Earth during infinity war. Who is this girl? Why is she doing this? Could she be an ally or enemy? What does the Fury suspect? Read to find out!!