is that she never lets her character become a caricature -- not even with that radioactive hair . 
(ROOT (S (VP (VBZ is) (SBAR (IN that) (S (NP (PRP she)) (ADVP (RB never)) (VP (VBZ lets) (S (NP (PRP$ her) (NN character)) (VP (VB become) (NP (DT a) (NN caricature)))) (, --) (PP (ADVP (RB not) (RB even)) (IN with) (NP (DT that) (JJ radioactive) (NN hair))))))) (. .)))
(ROOT (S (VP (VBZ ) (SBAR (IN ) (S (NP (PRP )) (ADVP (RB )) (VP (VBZ ) (S (NP (PRP$ ) (NN )) (VP (VB ) (NP (DT ) (NN )))) (, ) (PP (ADVP (RB ) (RB )) (IN ) (NP (DT ) (JJ ) (NN ))))))) (. )))