The power-struggles have been endless. The whining never stops. Unexpected meltdowns is making you frustrated and stressed out.
Keep in mind that such attention-seeking behavior is normal.
There are a number of possible reasons for acting out behavior. Remind yourself that all these misbehaviors might be your child's way to communicate about something she needs, something she want but doesn't know how to appropriately express, or she's simply needing your attention.
This is the absolute response when your kids are acting out that can change the whole mood in the situation immediately!
Simply tell your child "I love you too much to argue".
When the child misbehaves, resist the temptation to lecture, nag, scold, yell, or punish. It will just delay the situation. This will actually do more harm than good. So, relax and tell them "I love you too much to argue" then let go to end the friction.