I would def bring this up to her, I would not sign the new contract and point out to her that when signing three months ago you agreed to the rates to stay in effect until sept 2013 and that is what is right. If the contract didn't state the rates to stay in effect until sept 2013 I would think it ok to raise the rates, although it seems so close to your sign on date, she may have had the plan to raise rates in the works long before you came, although even then, she should have given a heads up. but, def stress the contract of 2013 and stick to that. Good Luck