It was said that if someone has a prescription for something like Xanax then they can bring it when they go to another country. That's actually not a given. Some meds are banned in other countries or more highly controlled. In those countries you often have to contact the appropriate department in the country, send your medication list and letters from your doctor, then they will approve your entry into the country or not with those medications. In some of these countries, you're to do that just three weeks before you leave, so if you've made accommodations and bought tickets by then you're at risk of not being able to go. Japan is one of these countries. So I wouldn't assume that you can bring any meds just because you have a name on a prescription bottle.
This might be down to editing, but did anyone notice what Caroline did in the last episode? Kate asked her how her foot was, or Caroline went up to her and told her something like "It's better, it even looks less swollen." Yet when someone else asked (Adrian, maybe) if it was the same or any better, Caroline said "no better." If that did happen that way, I think it was because Caroline knew she had used up Kate's store of tolerance for self-pity and she moved on to greener pastures.