If she has asked you to continue MC each time, then she is not ready to file for D. I know you want to take action, but pursuing her is not the answer.
Continue with the MC sessions as long as she will go. You are lucky to have 50 minutes of contact per week. My only contact was to arrange visitation with my kids. Don't waste it, keep your cool as much as possible.
If you do see D papers again, don't sign them. Tell her that you are not willing to go forward with D at this time. You don't have to sign anything.
