Hi there!
Nan is most likely suffering from Major Depressive
disorder.
Here are some signs you may see:
•Gives up easily. Does not feel she can accomplish easy tasks.
•Puts herself other people/feels worthless.
•Doesn’t do normal/extracurricular activities that she may normally enjoy doing
•Does not enjoy talking/socializing with friends anymore
•A change in appearance or dress. She may start wearing different clothes, maybe cut her hair, get tattoos, etc.
I hope this answer helps you! Please feel free to ask me for help anytime!
~Alexa