"After Beaver threw himself off the Neptune Grand, Veronica goes back to the hotel room he had gotten for himself and Mac and finds Mac crying because Beaver had stolen her clothes" all happened during the season finale "Not Pictured" (2x22), shortly after the scene where Cassidy kills himself.

"She's definitely alive, and very much going to college with Veronica now" is revealed in Tuesday's episode "Welcome Wagon" (3x01).