Have name changed as could be recognised.
MIL can be difficult. She is usually fine. She does have a dominating and controlling personality but usually her heart is in the right place and she is generally popular with people.
When something or someone displeases her though she loses her temper. She either lashes out (with other SIL) or does the silent treatment (with me). I can't bear tension/unpleasantness and this really affects me and I am actually a bit scared sometimes of her responses, even when talking on the phone so I try to end the conversation ASAP.
Afterwards she does feel bad and acts as though nothing has happened. Now that I am sort of used to the pattern I expect she will get over it but the tension can last for days. I don't think she will change now. I just need strategies for managing her and not letting it get to me so much.