What's the typical way that INFJs show their anger?
My mom's an INFJ, and I noticed that for weeks she won't get mad at anything--and then she'll just burst one day over something minor. She'll spend around five to seven hours extremely angry; at first not talking to anyone, then yelling about things in the past, and then not talking again. After someone apologizes, she'll just be back to normal again. It's really confusing to me.
Is this typical of an angry INFJ? And what makes them forgive someone?