See, this is where I see the difference. BFF doesn't give a crap what you had planned. So why bother telling your W? What do you expect? That your exW says to BFF, you should ask my husband first to see if he is making any plans before you do?"
Your Wife should have said "let me see if my H has anything planned for me first, and I'll get back to you".
Otherwise, she seems excited about the trip. Don't spoil it with BFF crap. The way I see it is, that is for your W to handle, on her own accord.