I hope she does overcome it. I like Beth, and I feel bad for what is going to happen to her. When she finally finds out, I think it will be as emotional as Gwen and Trent breakup in season 1.
I wonder how it will happen, what I would like to see, is the others get Justin to confese and record it and play it in front of everybody. If he is still there, I think Duncan would be the undercover person who tricks Justin into his confessing by complementing him of his evil ways, he is someone that Justin would believe actully his impressed by his evil ways.