What I'm reading here: You and your girlfriend have planned your first big trip. You're finalizing plans. You showed her options and she freaked so you guys had a fight and couldn't book flight. Now, you've sucessfully booked flight and...
What's the problem here, exactly? Your girlfriend could have a million reasons to be nervous about this. Going abroad or someplace new for first time? Taking relationship to new level? Claustrophobia? Fear of flying? General anxiety?
Or...just a thought...as you said: you often make the decisions. But now...on a fairly big decision about travel...you ask her. Good thought, don't get me wrong, but maybe she's freaked b/c it looked like you're unsure about big decision. IDK...
You haven't even gone on trip yet, right? And yet you're on this board whining about a fight. You say you're trying to be understanding and yet you say ...'she cant even', 'she panicked', 'she catastrophized'...now, you dont know if you want to go
Wait until you've been on trip. At least find out if this minor minor minor drama was worth it. Put it behind you, take the trip, and You'll both have a great time.
Make decisions like you claim you do and decide you're going to be happy and rock this vacation. Next time, make decision and just tell her. Next time she freaks, you're not gonna let it bug you. Stay calm and handle sh*t.
If she keeps freaking about things in general, stay calm, be understanding, and talk to her - not LetsRun - about it. If you care about her, try to get her help if she can't fix stuff on her own. If you try and things don't get better, break it off.
You got this.