Unfortunately she is confined to ACT I, so she's not able to traverse ACTs unless one tries polymorphing her I think.
BUT I wonder if it's possible to get her to be present during the epilogue party. On a technical level I do not know if the epilogue party is the exact same instance/layer of our actual ACT I camp, but if it is then theoretically she should be at the camp during the party if she was left there during ACT I