You might consider recommending to her, Christine Schaap's book "Bring it On". She wrote this to help women get through their MLC, or 'transition' as she likes to call it.
Christine, now a life coach who almost lost her H during her own MLC, has a line she likes to tell women who come to her for guidance, that as a husband, I really liked:
Originally Posted By: Christine Schaap
Your marriage is not the problem, and a new man is not the solution.
MLC is all about finding meaning and purpose.
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