Say you she stole the car from you and took you as hostage. She will then take all the blame and dump her. Youre only young and there is plenty more where that came from.
No seriously, I dont think anyone on this site is a copper or solicitor, so seek some advice. Citizens Advice Bereu will be a good start. They are impartial and not connected to the police or anything so ask these first. If ever you get pulled by the police and think you may have done something wrong, Im not talking about murder or drg smiggling here, but for traffic offences etc dont tell them anything. If they say you looked like you were going to fast say you werent, and ask for evidence in the nicest possible way. I was stopped the other night for speeding. I was extremely polite to the copper, but informed him i wasnt going over 30 mph its just my exhaust is louder than normal cars and so would give the indication of speed. Now the copper was parked up and didnt have a radar or anything so he couldnt have any proof. I maintained my manner with the officer, and he finally gave in and issued a producer. I thanked him for his time and drove away scott free.
Like I say, get some legal advice before you go to court or anything.