herself could be Plus stifled so missing .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 herself)) (VP_4 (ATVP_1 (VP_5 (MD_0 could) (VP_1 (VB_0 be))) (CC_0 Plus)) (VP_5 (VBD_0 stifled) (ADJP_0 (RB_0 so) (JJ_0 missing))))) (DOT_0 .)))