Skier780

So I’m almost positive my girlfriend is snapping other guys and I think she is cheating on me through the app. I know her password but I know if I log into her account on another device it will kick her off and she will know and someone told me she will get an email saying she logged into from another device. I don’t want to install a spy app on her phone. Is there a way I can log in without her knowing since I already have her password.