My business partner has abandoned the business and now wants money, what can I do?

I have had an LLC for only 6 months. My business partner has done no work for the last 2 months, when I've been working more than full time at our store. She refuses to help with the bills, and demands that I give her 50 percent of the sales every month. The business costs more than we make every month, with me putting out all the money. She closed the business account without notice and kept the money, it's a mess. I'd hate to dissolve the business as I have twice the money invested, and far more work into it, what other options do i have? thanks!