Board Thread:Character Discussion/@comment-13019683-20140901180344/@comment-24386552-20140903225156

They may have all gotten killed by Elizabeth Mitchell's character and lead Elsa to feel guilty, leading to her going to Rumplestiltskin and he deduced that she was too unstable to be standing before him and then he melted her and kept her in the unknown for the safety of everyone. But it's just a theory.