Very few people here wanted to divorce but they were left with divorcing or living as you are right now. They wanted R but it takes commitment from both spouses. You don't have any control over what she chooses to do. R isn't possible with only 1 spouse (you) working towards it.
We know it's difficult, we know it's painful, we know you never wanted any of this.
When you start taking action, you will begin to feel like you are taking back some control over this. It's the only thing you can do.
I think now is an appropriate time for you to make a list of requirements for staying married to you. These aren't things to make you her boss, they are actions you need to see her doing so you have some assurances that she is actually committed to R and not just saying she is. Because the cheap talk with no actions happens a lot.
This list isn't for right now. Once you start it, keep it in a safe place and away from her until the right moment. The right moment is when the actions you are starting now (informing obs and seeing a lawyer) compel her to ask for your forgiveness and what it will take to allow her to stay with you.
There is no guarantee she will ever do that though. Some spouses say fine, move out, and don't look back. As frightening as that is, remember you can't control what she does. You can only control yourself.
Everyone's list can be different but there are some basics it must include.
A NC letter to her OM (written by her, approved by you) it should be short, blunt, and void of emotion. It should state that he is no longer to speak with her, contact her, etc ever again.
Full transparency. She gives you access to all her devices. She deletes nothing in an attempt to hide it from you. You can at any time ask for her phone, computer so you can look through it. This isn't you being her boss. This is a trust but verify situation. If she agrees to no more contact, then she has to prove it by allowing access.
She needs individual counseling. Someone who deals with behavior issues and family of origin issues. She cheated because something in her isn't right. She has some issues that made cheating acceptable for her. Those need to be addressed and resolved or you will be right back in this spot in the future.
For her I'd make getting a new job a requirement. I would not feel safe as her spouse as long as either one of them has any chance of using business as an excuse for contact. No contract means none, zero.
MC is something you should suggest but not start right now. She'll need several months to start to unravel the issues she's been not facing. She needs to become fully remorseful before MC should start. Too many betrayed spouses want to believe their ws is fully remorseful before they actually are. Crying doesn't make her remorseful. Remorse is not angry or impatient with you. Remorse is not behaving like they are peeved they got caught. There can be more help in determining if she is actually remorseful when you get to thst bridge but that's just a start.
Since religion is so important to you, you might have a requirement that includes your religion. Something that will show her commitment.
There are other requirements but that's a few basics.
Have this list ready in case you need it. Trying to come up with such an important list on the fly isn't a good idea. Hopefully you have a chance to use it.
Good luck at the attorney.