Jac, you may have gone over this already but are you in the US, and if so, are you in a state that has legal separation? Was what you sent her an actual legal document or just a proposal? If wherever you live there is no "legal" separation (like here in TX), then you're in a tough spot. If you need financial support from her and she continues to ignore you on it then you will have to file for D and force her hand.
If you have legal separation then I would talk to your L about filing through legal channels if you haven't already done so.
Then after you talk to him, tell your W that you need a response by XX date or you will be filing.
