Typical teenager, she will grow out of it. This current crisis is affecting the mental health of children this age very seriously, which only exacerbates the problems.
Don't get angry, don't shout back (no matter what the provocation) Just be endlessly patient and just give her the odd hug and kiss in passing,
One day this ugly duckling will turn into a beautiful swan and you will be so proud of your wonderful grand daughter, keep calm and quiet now and she will still love you then.
Granddaughter delaying period, advice please
