Do I i have to pay for a month of living in a home that had no establish payment ?

If there was no meeting of the minds at the beginning and not even a discussion about how much the rent would be, she can't suddenly pull a number out of thin air and demand that you pay it.  Obviously, she can ask that you leave at this point, if you don't want to start paying rent.  But good luck to her trying to collect rent that was never agreed to! This answer is given in accordance with the laws of Virginia and may not be applicable in any other state.  It should not be construed as legal advice, as that would require a more thorough analysis of all of the facts involved in a specific case.  If you need further information or assistance, please feel free to contact my office for a consultation. Case results depend upon a variety of factors unique to each case. Case results do not guarantee or predict a similar result in any future case.