 Do you think that's what she wants? 
( ( ( Do you ) ( think ( that ( 's ( what ( she wants ) ) ) ) ) ) ? )
(ROOT (SQ (VBP Do) (NP (PRP you)) (VP (VB think) (SBAR (IN that) (S (VP (VBZ 's) (SBAR (WHNP (WP what)) (S (NP (PRP she)) (VP (VBZ wants)))))))) (. ?)))
Could she want something else?
( ( ( Could she ) ( want ( something else ) ) ) ? )
(ROOT (SQ (MD Could) (NP (PRP she)) (VP (VB want) (S (NP (NN something)) (ADJP (RB else)))) (. ?)))