Kathy has a Samsung Note 5 that she loves, but after a recent update, it's awful. It's changed all her colors, icons, message screen, and even truncates her messages. It's just a terrible experience. Leo says that Android 7 Nougat is a great new version, but it sounds to Leo like Kathy also got an update to Samsung's TouchWiz overlay. That's where the problem is.
The good news is that Samsung's phones can be themed and going into the Samsung App will enable her to change the colors, fonts and backgrounds. She may not be able to get it back to where she had it, but it'll look better.