my wife was hit by a car in a crosswalk. Should we sue?

My wife and I were crossing in a crosswalk. No cars were coming and we had the light when we started. Next thing I remember is my wife was lying on her back in the crosswalk saying the car ran over my foot. My wife is 82 and has been to the hospital twice by ambulance the first time right after the accident. The 2nd time was the morning after when I tried to take her to the bathroom and she could not walk and was complaining of sever back pain. Medicare won't admit her to rehab or hospital. A bone is cracked in her left foot , she has severe back pain and can't walk. The hospital sent my wife home in an ambulance. The lady who hit my wife did stop and call 911. I am still waiting for the police report to get the womans insurance info for my wifes medical bills. I gave the woman driver my phone # before I went in the ambulance with my wife and asked her to call me. It's been almost 4 days and she hasn't called.