I'm going to suggest that you read ForeverYoung's threads and as well as HaWho's threads. Both have spouses living under the same roof, in MLC...one wife and one husband. They both have have had their ups and downs but have figured out what works in their particular situations and trust me...this is not a sprint, but a marathon. It takes a long time to actually see progress on the MLCers side of the fence. That's why it is important to work on you and also keep the focus on you and your family. You didn't break her, therefore you can't fix her.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.