Need a car or suv

My car was repoed a few weeks ago..my co-signer went and redeemed the car, so it's now in her possession. She is so hateful and will not let the finance company know I no longer have the vehicle. So my score dropped.so I was unable to get to the job I had been on for a month..I have doctor's appointments coming up. I have my grandson during the day, along with 1 other sometimes 2...I can't take them out to the museum or park like I normally do. If you know of any dealerships that will work with me I don't have a downpayment.