"Let my mother go"? Doesn't sound like a routine "Ma'am are you aware that you were going 31 in a 25?" Were they getting pushy with her? What's the deal?
I seriously doubt the police officer was doing anything which warranted throwing objects at her. Possible, but not likely.
The article may have incorrectly stated that Dee was throwing anything, but at any rate,
if that is what happened, it's not wise to approach an officer screaming and throwing objects.
Best thing to do is wait until the facts come out.
Or just assume that Dee = Trayvon Martin according to the media the day after the shooting. Whatever floats your boat.