Chrissy turns into a phsyco

chrissy kills Zoey cos she's going to the police and drags her body into the square as if she's been attacked of an unknown person,then a few months later she finds out Sam is going to tell her family what happened in the vic that night,so she arranges to meet Sam on the canal bank by saying she has a proposition for her,when she gets her there she pushes her in and watches her drown,that done she thinks she's home free but on christmas eve Sharon comes home saying she' going to phone the police cos she's worried about Den ,Chrissy snaps again and is just about to lamp Sharon with the queenvic statue when daddy dearest appears and saves his princess,Chrissy is took of to the nuthouse,but nobody susspects her of the 2 murders,so how long will she stay lockedup,how safe are the Watts family.