How can I get my business partner to let me see the bank statements?

Question Details: I'm in business with my sister. No contracts or agreements were signed - just a verbal 50/50 ownership of business where she would be the administrator. She never put me on the signature card for the bank I do have the paperwork stating 50/50 ownership in LLC. And our accountant does the books that way. Ive let her run the business but now would like to get into the bank account and she refuses. Is there anything I can do/say? Should I get a lawyer?

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