Hi, and welcome to the community. I will get right to the point and tell you that I was almost a WAW. As far as your stitch goes, you do not need to file for a D and get it over with if you still love your W and want to remain M. It does sound as if she has signs of MLC but they are very similar to WAW symptoms. Have you read Michele's article on WAW's? If you have not order the DR book, then you need to get that for your "tools" on how to bust a D. You can get it from here or Amazon or book stores about anywhere. Don't discuss the book, this board or what you plan to do with your W. If she's in MLC, it is going to take a long time for her to get through the ride, so you need to know for sure that you can take it. It is not an easy thing to do.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!