Weddingbee boards

Sounds fine to me. I would not be offended if I were invited this way. I think most people would be understanding since you have worded it nicely.

If you haven't yet made the invites, you might consider using "since" instead of "while":

"Since Christine is having a very small wedding overseas, she would love to celebrate with all her girlfriends before departing from singlehood for good!"

To me "while" sends the impression that you have something to apologize for that these people aren't invited to the wedding; "since" says they're important too. Perhaps I read too much into semantics though!

I think including that it is a small destination wedding will help so you don't step on any toes, but I think that anyone who is close enough to her to be invited to the bachelorette party probably knows already that it's a small wedding and not many guests are going to be invited.