@Archmage MC It looks pretty defined to me. Well, except the Magical Prodigy bit. That could use some clearing up, imo.
Yeah, and thats the bit that'd spiral out of control very very quickly, especially since it also makes her a spellbreaker and I'm going to guess allow precision stuff. That combined with augmented body to make her as strong as Thor as a MAGE? yeah thats too much.
Now if the power was something like Rubick from DOTA 2 where she could copy the last spell used by someone temporarily and forget it after some time or when she copies another spell, thats well defined and works well.