Is she in offline mode? This happened to me after the last version update although I do use Android. I also found that the cache size was reset to the minimum through the update for some reason. I reset the cache size to a reasonable value and the incorrect track labelling fixed itself somehow overnight. Maybe it re-downloaded tracks or re-indexed it's database, who knows. I'm just happy it did because I wasn't looking forward to downloading 100GB of music all over again…

If she is offline have her put it back online, check her cache size and maybe change it to a few GB of it's sitting at something silly like 10MB and wait awhile to see if it fixes itself.