There is many ways of chelly going crazy. One of the common one is being alone for too long. In her past. She was always alone which made her go crazy and always be in a dark room. Until one day someone found her and took care of her.
No one know what happened to her family but it seem they abandoned her.Chelly sometimes want to be alone but if she alone for too long. She will start to lose her mind and go crazy. This once happens when she was friends with twilight and twilights's friends. The one who return to normal was no other then Pinkie pie.
The cupcake at the top is a joke. Anyway i got bored and did this.... I don't know why.
How to know if she going crazy 1. Her hair to bit flat but not that flat like pinkie going crazy. 2. Chelly will somehow dye her hair a bit. (White patch) 3. Her eyes will go dark and as well with the star on her hat. 4. She seems to twitch. (aka the eyes)