Billbrusky, 44

Just looking to an answer to this. I recently bought a car with my girlfriend. She doesn't drive but paid for the car with her debit card. Everything is in my name only including the bill of sale. Her name would only be on the receipt from running the card. The dealership said it would take 3 to 4 weeks to send us a title. That was 2 weeks ago. We have broken up since then and she went to the dealership and demanded that the car be put in her sister's name. They agreed to do so. I moved out and have the car in my possession with the bill of sale. Is there anything I can do in this situation? Is my insurance still valid on the car if the information is wrong now?