Since you aren't in the same room as she was, I would lean more toward the fact that there is something sensitive about you that attracts her to you. She knows she can make you aware of her, and it has worked thus far. It's very possible that she could have followed you. She very well could have attached herself to you as a cry for help, begging you to notice her so she can tell you her story. She may not be able to leave the dorm, so she may only be with you while she's in the dorm, but she can follow you from place to place within it. Have you felt her anywhere else but within the dorm?