Sailing, you realize that if she is in MLC that this could take years for her to get through, and that nothing you do can "fix" things for her? She is on her own journey for answers right now, you have to except this and work on building happiness and fulfillment in your own life.
I hope you are reading and learning about MLC. Do your homework, let her go. Play your cards right and she may be back. This is my plan right now.
M: A really long time. Crisis: 5 years. She's still worth it.
Life is never made unbearable by circumstances, but only by lack of meaning and purpose. -Viktor Frankl