The audacity of her to call Mia, eugh.
Also with Koto's dad absent from the picture, I can see why her mom has become overbearing and a bit unpredictable. She is desperate to keep what family she has left, but I truly believe she does love Koto.
My mother was also kind of similar to her growing up so I can understand it. Despite my moms shortcomings she does love me very much.
Also I hope Miya accepted just to put her in her place.