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Unfortunately, I hear this all the time. So much for trust.
Also unfortunately, your ISP or e-mail provider won't be willing to help you. You starkly violated the terms of your account holder's agreement by giving ANYONE ELSE your password.
Well, some people unconcerned with computer security ethics might go ahead and commandeer HER account, and maybe you could reach an agreement.
But you should be able to go to gmail.com and try to recover your account--if she isn't CURRENTLY logged in. Does she know the answers to your security questions? LET'S HOPE NOT. And NOW we learn a lesson about women: trust ONLY your own mother and grandmother. See Ecclesiastes 7:26 for King Solomon's views on the matter.