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Do you mean coming back to seek more money from you because you her employer or because she helped build that business or is it simply because you lived with her?
Then what you really need is to have a lawyer draft a very simple release for you. And what is vital is that she take the release to her open lawyer to get independent legal advice. That way she can never come back and say that you pressured her to sign or that she didn't understand what she was signing.