I don't believe that Berry was truly
evil myself - just twisted. I admit that I didn't care for her quite so much to begin with, but she grew on me with repeated viewings, and I agree that it's a shame that Foster's never tried to utilise her again.
In regard to her circumstantial eviction from the house, I'd kind of gotten the vibe that, even without the giant rubber band ball, she'd have been on her way out of there one way or another by her own free will. I think this was implied in her line
"I can't believe I stayed in this stupid house, with these stupid people!", presumably an admission that she'd only remained at Foster's in the hopes of obtaining a relationship with Bloo (but possibly just a matter of hysterics). What would seem contrary to the Foster's creedo would be if Wally had really been evicted, as Mac had speculated in "the Big Picture".
Whether we see any further activity from her or not, Berry's legacy undoubtedly lives on. Nowadays it's impossible for me to watch Stacey's scenes in
Wayne's World without being reminded of Berry.
