It's so sad that the timing in a couple's R can get so off. She felt as if she gave & gave without getting back what she needed. You, like most men, was focused on making her a good living. Now she feels used up and has an empty take.
I think she's going to have to find a way to let go of the anger, or the M won't survive it.
She may or may not meet up with OM. I can see how she could just want to leave the RH and you to escape for awhile. I think when a couple ownes a business like that, their personal relationship and business can become meshed enough to cause burnout with both.
I don't know much more that you can do. Continue to have patience with her until you know more.
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It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!