as long as you can trust her, there is no problem. if you doubt her faithfullness, then you will be driven wild by it. If you can trust her, like for real, you should know that she would never do anything like that. but if you even have a tiny voice inside yoru head telling you "omg she was out the whole night, where has she been? she must be cheating" or something less severe that makes you doubt her, youll be crushed.