Your child is showing severe signs of stress.
Children thrive and feel secure with routine and structure. I mean a good routine, day in day out. IF there is a change, they need a heads up. It literally can make them feel like they are sliding down a slippery slope when there is no set schedules. .
Make sure you have a good schedule each day. Changes need to be discussed so that she has a heads up.
Rules need to be enforced, Throwing anything in the house is not allowed EVER.
Throwing an electronic device in our home, would mean our child would not be allowed to use it for a very long time and I would mean.. weeks at least and even then, she would have to be perfect.
Behavioral fits like this would mean your daughter would need some type of cooling down time. away from everyone and everything. We never give a child anything that they throw a fit over.
When our child whines, yells, etc.. she is to calm down and use her regular voice to tell us what the problem is, or what it is she is upset about, But she knew, you throw a fit, you will not get a thing.
I know you have a lot going on right now. But these behaviors are a sign of stress in your child. Something is going on and you must take time to figure out what it is. She does not know what it is. As a parent you need to help her figure it out.
What has changed? What is different? What is going on? Are they with a new caregiver? Have they been upset since school let out?Has your schedule changed?
Watch your child carefully. Listen to what she is saying. What is she doing all day?
This is how I would figure out what was upsetting, frustrating or making her act not like herself.
Never underestimate your children, You can tell them the truth. You can tell them you need their help.. be specific.
But also allow them to do the same back with you.