Just an FYI, you have a path you are on right now and you are sticking to it. If you are stuck, then it will show up and we are more likely to prod you along...
While your W is making some odd choices, such as going on a vacation when it is your son's b-day. that does not necessarily mean it is (a form of) MLC... Maybe there's something to what your W's friend is saying...
If that's the case, then we aren't really dealing with crises... rather with a transition that is still in process (ie. she is "finding" herself) or she might even have some undiagnosed PD...
But while you are searching for a "reason" your W is behaving the way she is, you are loosing focus on what is important as far as DBing is concerned...
That is... finding YOURSELF...
I will opine that you have done some positive work on getting your self and your emotions in order... but you are still wanting to put blame on something...
Whatever "it" is... it is... that is going on with your W...
Let's do a recap, here:
What have you done and how have you become a man that only a fool would leave?