[MMM]

This is pretty normal, actually, and is something I am sure many of the fan-kids here will experience.

I wouldn't take it personally. This can be a sort of defense mechanism when on a long-term (more than a couple weeks) exchange to a very foreign place. It's culture shock, and she probably feels like she is alone on a liferaft in the middle of the ocean, and the liferaft is sinking. The only way to stay afloat is to fight back.

Don't expect an apology, just offer her support. She may not realize what she is going through.