[stands2reason]

Hitting him with her car may have not been premeditated, but she left him there to die. Unless she thought he would magically heal and walk away from her garage, I'd say there's a case for premeditation there.

[weegee]

Bringing him into her garage and refusing to release him makes it a case of kidnapping. They can seek the death penalty. Byrd's death in Texas was ruled a kidnapping and they didn't even take him home.

The criminals in the Matthew Shepard case left the man alive but injured restrained to a fence.

Additionally, she conspired with others to dump the body and destroy evidience of the car.

[Irene Adler]

"Unless she thought he would magically heal and walk away from her garage, I'd say there's a case for premeditation there."

She kept "checking on him" to see if he was dead, yet so she and her boyfriend could get rid of the body. Sounds a lot like premeditation to me.