I think the nightmares were a combination of both Caylee' s death and TL and KC. In her way of thinking, the riddance of any encumbrances (like Caylee?) that limited their time together was solved. Only, more time together wasn't matching up with her fantasy of: the good life. She couldn't tell him what really happened, because he didn't care enough about HER?
Do you think she will eventually turn on TL and blame him for what happened to Caylee, for instance, saying that he never wanted to see her unless Caylee wasn't there?
no I dont, I dont think she will ever admit to it