She just got back to town after staying in a boarding school for bad behaved kids since she just turned 18 she’s finished. She was on lots of drugs and being a wild kid so they sent her away. After they died they told aunt Jenna to keep her there since she ‘needed’ too. Elena hates her but Jeremy loves her.

She in the grill when klaus walks in and she does know about the supernatural world since she’s a witch.