Is she desparrate?? ?

no she isn't desperate, some girls just like the bad boy type. And maybe your just not her type. you just have to let it be, because if you keep trying to convince her that she shouldn't be with the guy she is with now, then she'll become annoyed with you and stop talking to you completely. So just don't try interfering with her. If its not meant to be, then its not meant to be.