Have you made arrangements to get your D in to counseling yet? From the behavior you describe, she is definitely showing signs of being in distress about the sitch. Keep reassuring her this has nothing to do with her and that Mommy and Daddy love her very much.
You sound like a great Dad and are doing what you can for your little girl, but she sounds like she may be having abandonment issues. For that you need to get her some outside help to deal with it.
Did you have a chance to read that chapter on MLC yet from MWD's DR book? If you have, did anything about your W's actions seem to fit? Since there is no clinical diagnosis for MLC, it's up to the LBS to determine whether they think it's MLC or not.