She has whatever rights or power your partner wishes to give her, since he can delegate to her. You can't keep her out of the business if your partner wants her in, unless there had a been an operating agreement which in one way or another stopped her from participating at all. You also can't get a court order to keep her away unless she is threatening you with violence, harassing you in some legally actionable way, stealing from the business, etc. (I.e. it has to be bad enough to get a restraining or protective order.) Unfortunately, when you partner with somene, you effectively partner with their spouse, too, unless there was some agreement or structure in place to prevent this. You may be stuck with her.