Cash for keys question

[Enrique H.]

I have a tenant wjo hasnt paid rent in months, I offer to forgive back rent plus 2 free months ( wanted for her to ha e a house for Christmas and fistr month of the year) we sign a new agreement. she called said she could be out tomorrow in exchange for 600 dollars, I jumped and said sure.
she called and said she s out now that she wanta the 600now  I said no, Im going to make sure everything  is clean and now she said, well I dont want yoi in the house till the end of the month.
my question is do I have to wait till the end of the month or can I go in tomorrow?