Sounds to me like she's already well on her way. No more service. That's a big one. Sees serious flaws. That's another big step.
Be patient and don't push it. The process has begun. You probably need to say no more. Even if she opens the door, make sure you don't drown her with WT criticism. Give her time to think it out herself.
It sounds to me that all that is left are the meetings.
Take her out. From time to time plan the outing on meeting nights. Go away for the day on some Sundays. If you have a good time, she will begin having no problem missing meetings. She may even begin helping you plan activities to get away from attending meetings. We've seen it happen to friends of ours. Buy her a thoughful gift near but not on Christmas, her birthday or Valentine's day. Tell her it isn't to celebrate the holiday. It's just because you wanted to buy her something. She may come to understand there's nothing wrong with letting someone know they are special. Point out to her how great, generous and kind some worldly people are. She will make the contrast herself. You don't have to do it.
Once the meetings are over with or she attends once in a blue moon you will probably be where you want to be as a couple. Faded but still able to have contact with your wife's parents. While they may feel somewhat upset that she no longer attends, they are surely somewhat prepared since she has stopped FS. And faded is sure easier to accept and deal with than df'd.
In all the situations I've seen the biggest challenge is time. The person leaving needs time. Don't be impatient. Give her the time. It takes time to get someone in and it takes time to get someone out.
Good luck!!!!