Thanks for your question. Has your fiancée appealed the decision which from your narrative appears perverse where she has invested so much into the Uk and is providing employment? If not she should. She should also submit a covering application to extend the entrepreneurs visa for a further two years. If you marry her she can apply for a spouse visa and then upgrade that to IDR prior to the spouse visa expiring. That should give her several options. Given the circumstances, however, I would recommend she sees a good immigration lawyer who can sort this nonsensical situation out for her. I hope that helps. Please leave a positive rating so that I am credited for my time.