It's FUN watching her get indignant, as long as she ain't yelling at YOU.
Her heart grew indignant, that ten flowers cost that much money!
moral outrage - at corruption, murder, etc. It doesn't have to be expressed by yelling, though. It can be hidden inside.
resentment, burning slow anger.
The HEART grows indignant, but the MOUTH spews.
ムッと 怒る 憤り 憤慨 恨む 癇癪