If she knew, she would tell you. If you push for an answer before she is ready, she will almost certainly choose separation.
If YOU want a separation, then ask for one. If YOU are done trying unless she decides she wants the M, then tell her you are done being more into the R than she is. REPORT what is going on with you. I have no idea what is in your letter, but your tone on the board is, well, let's say whiny and needy. You aren't the victim here. It is your choice to work on the M or not. It is your choice what you put into it. If you aren't happy with the results, change your choices.
Why put all this on W? What W wants is time to figure out what she wants, she told you recently that she doesn't know. She's not going to have figured it out two weeks later while she's been preparing for and taking finals.
