I honestly don't see this as all that different that a regular marriage that has unraveled. She truly felt that she didn't have a partner standing beside her.
I still go back to Aspyn being the grown-up in the equation and pointing out to her Mom, as they were leaving Las Vegas, that they are always searching for something/not satisfied. And how exhausting that can be.
Time will tell if this was truly part of Christine's personality or her spirit knowing she needed to make a change.
(I do think she must be thrilled to not be in Robyn's orbit on a regular basis.
)