Estate Law Questions? Ask an Estate Lawyer.
A person can distribute their estate in the manner of their choosing. However, if you have reason to believe the will was entered into due to undue influence or coercion, that would be a reason to contest the will and get the will invalidated as to that portion.
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I think you are looking for the answer "she cannot do that and you are entitled to the house" but that would be inaccurate. Good luck to you and I hope you find the answer you are looking for.