It was a dream, so of course she did not. Also the dream was from Elliot, it had nothing to do with Alex.
Lastly i sincerally doubt anything along those lines will happen. Alex is pretty much locked in a poli route with her twin Chris and younger sister Sam.
She pretty much despises her older sister and even after the rape thing Elliot still shares some of the blame for what happened to Alex. I would bet on her going to jail or more likely staying in probation for her part on everything, being raped by another of the accused involved in Alex's sexual assault may serve as mitigating factor for her.