Listen I know it's a silly theory, but it could work right?
She's clearly not an emotional stable person (not many are in this VN tbh
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), we can make her behave pretty nasty in the prologue.
She comes back expecting for things to be the same, and except for a very minority of players (monk runs?) things won't be the same, and she just can't accept it, so she just joins the axis of evil, Vinnie, Stephen, etc...
More realistically I think what happens on the bench, or at the camping party, won't preclude anything, I might be completely wrong, but the unique way she was broght back into the picture makes me doubt she'll be relegated to the background so fast.