Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-16047999-20130820180833/@comment-24642928-20140318152048

Haven't thought about this issue but here's some info. According to this interview, Crystal asked to leave the show since she's 29 and on Teen Wolf she's playing a 17 year old and wants to do other stuff.

http://insidetv.ew.com/2014/03/17/teen-wolf-post-mortem-crystal-reed-interview/

IMO, the only consistent-with-the-show way for her to leave was probably to die since she's not going to pick up and do something like boarding school in the middle of all the problems are going on in town.