books where the fmc is going through something

I want books where the fmc isn't okay and is suffering through something like mental disorders, etc. It can be something that happened to her in the past or throughout the book, but i'd prefer the mmc and her friends to notice it and try to help her.

bonus points if its fantasy, tyy :)

i feel like characters in books just don't really react to the trauma around them and i find it hard to believe that they can go laughing the next day after witnessing something traumatic. Pls help!