Yeah, I hate it but my brain keeps coming back to Stacy being a "mole" for Ryker. She doesn't like it, she detests Ryker, but she needs to do it so he will help her pay for college/some other logical reason. Or... Maybe she's not a spy for Ryker but instead is one for Katie. I just wonder what Katie's motive is for everything... She was trying to wrangle Charles before Ryker, Ryker was looking for Charles and wouldn't take "I don't know" as an answer... Rivalry between siblings over control of the school/town/team by any means necessary? I am sure someone else has said all that, I am just now starting to think of it as a possibility...
The reason she immediately left when Ethan told her that Willow was his sister was because she had to report that development to either Ryker or Katie.