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Do the two of you actually have a written operating agreement (you would have put this together when you formed the LLC). While a written operating agreement is not required by state business laws when forming an LLC (you can legally do everything on a handshake) it is usually better to have one because they contain provisions regarding what you do in the event that one partner wants to leave the business, or if the business fails what you should do in winding down the business.
Paying a few health insurance premiums out of a business that you largely financed is not in any way illegal nor does it give her any grounds to sue you for that amount.