Uhm, either she calms the hell down or you do actually need to dump her.
She may mean a lot to you, but that desperation to talk to you, and placing guilt on you to talk to her when you're on a trip with your family is bullsh*t. She's needy, inconsiderate,and immature.
The real question is, do you want to be in a relationship with someone who is likely going to be this way for a very long time possibly forever?
"Well, then," the Cat went on, "you see a dog growls when it's angry, and wags its tail when it's pleased. Now I growl when I'm pleased, and wag my tail when I'm angry. Therefore I'm mad."