Feel like such a bad mom

Me & my family were at the park watching my bf play baseball we were getting ready to leave because my daughter had to use the restroom my bf was staying to finish their game so I grabbed our stuff and started walking towards our car . There was a car in the park not in the parking lot but in the actual park. And so I realized I had my bfs wallet and got scared I dropped it so I told my 5 year old daughter oh wait let’s go back so she was a little bit behind me & she was playing with an umbrella and then I heard Ay ay ay and I turned around and the car was reversing and I quickly grabbed my daughter I was upset at my self but also told her please pay attention and the men that were saying ay ay we’re basically telling the driver wait. I feel like a bad mom I’m feeling guilty if something would have happened to her. I’m just upset with myself. First of all the car should have never been in the park near the baseball field but second I am angry with my self for not grabbing her hand