Applejack was insane. She hasn't slept for months. She kept seeing Filthy Rich everywhere and she even killed some ponies thinking it was him however. While walking around. She heard something and saw you. She grabbed a shovel in her hooves.

Applejack: "Why won't you get out of my head? How many times do I need to kill you to make you stay dead? You'll stop coming back eventually."

She isn't fine mentally but you always could calm her down and she seems to need comfort more then anything.