She previously mentioned something unhappy/unlucky happened to here recently and she decided to talk to us about it today. Thankfully, everything was already resolved but it still sounded kind of bad. Disclaimer: I'm not a medical expert, especially not in Japanese, so I'm not sure if my terminology is 100% accurate.
She had planned to go to the hospital one day to pick up some medicine (hospital system is very different in Japan, people go there for very minor things like a cold already, it's similar to a general practitioner in other countries) but when she woke up that morning, she noticed she had some kind of small bump/lump at the back of her neck and it felt a little hot to the touch and hurt when you touch it. So she was already going to go to the hospital anyway, so she had it checked out just to make sure. At first, there was some scary talk that it might be a lymphedema which could be cancerous but they thankfully quickly figured out that that can't be it because that kind wouldn't hurt when you touch it. She was sent home with some medicine and told to observe it for a couple of days and she just kept on streaming as per usual. The next day when she checked if it was still swollen or not she noticed it had already shrunk a it but was still hot to the touch and hurt a bit. On the third day, it was even smaller but still hot and hurt so she was starting to worry that it might be something serious after all because i was still there after three days. She went to an ENT who'd probably know more than the people at the hospital to figure out what's going on and told them that it used to be swollen but has subsided already but still hurt when you touch it. The ENT figured out that it is some sort of lymphedema that is most likely caused by a viral infection or something the like but it wasn't known what exactly it was. She was given another medicine and it quickly subsided and vanished after. She was wondering how the hell it happened but has no idea but she's wondering if it has anything to do with her lifestyle, but then again with all the dance lessons and stuff she's out and about quite a lot these days, so who knows, She's just really glad that it was nothing too serious and that it happened before the Holofes, so it didn't impede her ability to appear there for us.