I think the toxic waste should of just made her bald, not a mutant. The whole episode could have been her self consious about her hair and going to Zoey as a potential friend and support. Dakota could have also been worried about Sam liking her because she was bald. In the end,, Sam would say her looks don't matter and he likes her for her. That would be a way to teach the same lesson without turning her into a monster. If not, they should of just had the marshmallow of toxic loserdum touch her and have a reverse effect.