I'd have to agree with your attorney when he says just close it down, liquidate the assets, pay any bills, split what's left and start over. Given there's no "business" per se, there's no reason she should receive any payment for anything that may happen in the future.

If she continues to insist that she's entitled to a share of the profits into the future tell her to offer you the same deal and you'll take it.

All you have to this point is an idea. There are thousands of ideas and all are worthless until someone turns them into a profit... that part hasn't been accomplished to this point. Just both take your losses and start anew.
Good luck
Denny