Things that seem clear to me:
1) No, you do not trust her. Aww, I know it sounds bad, but it really is hard to trust your SO completely. It is also something that you need to aim for in your relationship.
2) If she is going to fool around on you, trying to keep her from going on this trip will not keep her from being unfaithful.
What to do is a harder question. I would trust her because what has really changed? Sure it might be easier for her, but if she was so willing she could be doing anything that is warm while your back is turned. As for her safety, she should know who she is safe with. An old friend is reasonable to trust because if you cannot trust a friend you have known for 4-5 years you should probably be watching your back.
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