I hope you have got your worrying under control. Based on your posts, you were beside yourself knowing your W was taking a trip with the friend you don't approve of.
Like Coach said, you have to know you will be OK either way since your W's decision is hers to make.
As an example, if it were me, I would have two goals in mind when I met with my W like you are going to. 1) To get a more clear picture of how she's feeling. This is done by questioning (not interrogating, but conversational questioning) and listening. 2) To have her leave the meeting thinking something like "Gr8day's demeanor seemed different. He's doesn't seem all worried like he usually does".
At first she'll think something like, "well that won't last". You've got to keep it up and make it become the new you.