My Friend Got Me In A Car Accident And Promised To Pay My Er Bill If I Didnt Submit To Insurance And Now Is Refusing To Pay It After I Got The Bill

My friend ran her car off into another car on her property. i have a previous neck injury that acts up if messed with and the accident gave me severe whiplash and a minor concussion. she didnt want her rates to go up because her parents pay for her insurance and she didnt want to be kicked off of it. I agreed under the clause that she would pay off my medical bill, i had gotten the bill in the mail previously and she says shes not going to pay it, her parents know and theyre not telling her to pay it either. Its too late to submit to insurance and really need to know what i need to do so i dont get taken to court AMA if you have questions