T.
HI J. P
You said that this just started occuring a couple of weeks ago. Did anything happen at that time. Normally this type of behavior has to stem from somewhere. You said her father is in law enforcement. Has his schedule changed? It sounds as though she is looking for attention. She may think that when she did this,the spotlight so to speak is on her. Even though she gets put in the corner, she still has you and her fathers attention.
You do need to explain to her that this behavior will not be accepted. I agree that instead of going to bed early, that something she really likes is taken away, but you and your husband spend the evening doing something with her that explains this behavior is not acceptable. You may try coloring or drawing pictures. Let her draw her feelings. You may get a understanding as to what she is feeling. At 4, its hard for her to vocalize what she is feeling.
Hope this helps!