A Hedge Witch, master manipulator and a former student from Brakebills (she was expelled three months prior to her graduation), she taught Julia how to use magic after Julia was denied admission. Things got hinkey from there and technically she died, but in the new timeline (timeline 40), she’s alive again. And has a girlfriend.
She’s still a manipulative nutter.
By the end of the series, she’s given up on crime and is trying to make amends.