Thank you for putting some information and backstory of your sitch here. I have a pretty good idea of how things are in your house.
It seems to me that your W stole those money orders to fund her affairs. That is what people do when they are in affairs. They just DON'T think clearly at all. If you haven't already, I'd take proactive steps to ensure that the mortgage is paid on time and not have to go through W's hands. Have you taken care of this, Joe? If not, then please do it asap. There are several ways to do it. You can discuss this with the bank. It is done to protect your home and your family for they live there, right?
Now let's focus on your W's work history here. It seems, based on what you write here, that W loses interest in each job because the newness and allure fades away. I mean it is true every job. I am going to walk you through the process of diminishing your own resistence to W's current job.
As you know, all energy is neutral. How one channels energy and focus on is what moves the energy. The more a person resists the very thing they DO NOT want, the more it expands and comes at you twofold or tenfold depending on the viewpoint.
Let's take your case here in respect to W's work. The more you DO NOT want W to work in her current job, the more she'll focus on it and stay at it. You ask how?
Sure, I'd be happy to explain. The more oxygen you give to a fire, the bigger it rages on...gobbling up everything in its path.
Do you see where I am going here?
Eh, you go first. Please tell me where you think I am going here. You are the student, and I am your teacher. I think you're a smart man and can figure this out. I'm happy to work with you on this if you put forth some effort here.