Ok aparently you care for her. However she's very insecure and doesn't trust you. She's also very possesive.
You should point out to her that's she's being very irrational and so insecure to the point that she's willing to throw away your entire relationship on her personal issues.
Quote:
She replied "I dont know but if im allowed im going with friends"
Whats that all about ? so now even if she's allowed she will
on purpose go with anyone but you ?
I mean , you invited her to come with you and that's her answer ? That's just so wrong on so many different levels.
My advice is that you should just go on your vacation and enjoy yourself. From my experience , those kind of girls always fuck with your mind like this. They'll always get butthurt over something thats actually incredibly stupid and they'll escalate it to the point of "i wanna brake up".They crave attention,they want to be the center of your world. And instead of earning that place in your life they try to take it by force with ultimatums and degenerate behavior.
All in all ,it's just not healthy to have such people in your life. Feel free to explain all this to her. If she understands and cools down than good for you. Otherwise just find yourself a normal person.