Responses
No matter how hard people try, we can never completely control our emotions. There's bound to be something that's going to make her sad, angry, anxious etc. We never know what the future holds, so there's no telling if she's going to get (really) emotional again and hurt herself or someone else. So if they really want to avoid her death they either have to make it so she can never use magic again or teach her how to control magic.
Wouldn't she stop blowing up, if she learned to control her emotions? It seems she only blows up when she gets emmotionally about something.