Sounds like someone was looking out for the company's interest. Look at it from their point of view, 2 employees treated and transported a patient that didn't need to be. On company time.

You set your company up for a lawsuit if things had gone wrong.

It's always nice to help other people out but if the patient needed to be transported then you should have called for an ambulance. You treated and transported someone in a private vehicle against her expressed wishes, you could have been charged with a crime. Who's going to pay her hospital bill? Who would the patient blame if she'd been further injured due to you getting involved? Simple answer, whoever's got more money, you or the company.