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1.Let her go, but call her on phone randomly to see what is she doing. She will ask you why you do not trust me? You tell her, its not that I dont trust you but I dot trust men up there if you were drunk that thay will try to use you... So, you should sound like you affraid for her.
2. tell you male friend or female to go with her or separate and let they see what is she doing and then..you get the picture
3. bug her, buy small microphone and see what is she talking...
Reality of situation is that she will get laid at party...but the think is will you know it...
4. If you want to test her, send one of you best friends and let he test her would she sleep with him..
This is perfect moment if you want to break up with her...
For real man? Buy a small microphone and stalk her??
To OP, don't do any of the above.. This is something an insecure bf would actually do.. And it's very unattractive to the girl.