You sound too reasonable.
I'll assume this bothers you emotionally, that's why you're here.
Show her your passion and jealousy ; I think most people really like knowing that their mate is possessive of them.
Shrugging this type of behavior off, with a "whatever you wanna do sweetheart " type attitude, can make a woman (or man??), feel like you don't matter to them..
Her proposed plans with her "friends" are over the top ridiculous- -- photo shoot at romantic location, my ass.
That said, I had a male work friend that I socialized with, only when my boyfriend (now husband) , acted all nonchalant about our relationship and how long term it was going to be.
Mark your turf.