I can't quite believe how much of a joke she's making out of collapsing through being exhausted and not eating. I understand joking about it to your friends as a bit of a coping mechanism but it's a serious thing to happen especially to someone so young.
The obsession with holidays is so strange to me. She's got a nice new flat and has the dogs, a chilled week with dog walks, good food and plenty of water will be much better than baking in the sun for days followed by more travelling. She lives on her nerves by the sounds of it and it'll likely just get worse.
I feel this is a theme nowadays when people break up. It almost gets glamourised? Throw yourself in to work and partying etc. Easy for me to say but if I had the platform Molly does I'd be showing it's okay to time to heal from such a life changing event instead of pretending everything is okay while literally running yourself in to the ground.