Oh! Wow! I never knew this! I've only seen her flying and punching or else using whatever power she just acquired moments ago.

Hmm. I can see why Marvel would think twice about a hero with so many different power sets available. She would be very hard to write. You'd have to remember every power she ever acquired. You'd also need a villain who could overcome all those powers.

Was she ever classified as Omega level? Her power as you've described it would seem Omega to me. Especially since she could steal an Omega mutant's powers!