losing account

Hi

Me and my sister play candy crash saga on different account and different phone, but recently when i log out of her game to play my game i lose my account but still its working with my email i try logging out in both drive but still its one game with two emails and if i change anything in my account ( like my name) it will change in her account too and both of us are playing one game.

please help me to fix it, i was in level 441 and my sister was 451

thanks