Well, you might calm down a bit and breathe.
Now...think about it. Just because there is a condom in her purse doesn't
necessarily mean she is sexually active. And, even if she is, finding a condom would tell me that something you said got through to her. Maybe she's keeping it for a friend? Maybe she put it there to freak you out in case you dug through her purse. Whatever the reason for it being there, you have time to calm down before your daughter gets home and then you can ask her about it...in a non-accusatory way, of course.