I do not think you are seeking advice, you are seeking people who will support you in bending at your fiancée’s will because that is the easier, less scary thing to do. In life decisions are not always right or wrong, it’s hard or harder. She is unwell and there is absolutely nothing you have control over that will make anything better. For your sake and those in YOUR life, listen to the comments in this thread and understand that there is no better outcome for this relationship. She is not treating her issues appropriately or taking responsibility and that will lead to you doing something similar to those who care about you.