Shameful parenting moment

I kind of hope not very many people read this blog... It has become my journal. I share everything here, good and bad.
Yesterday was bad. Yesterday I felt like the worst mom in the world. I got distracted for a minute, and everything could have changed.
Here's what happened: Kendall woke up early from her nap, and I knew Billy wouldn't be home for a while, so I decided to take the kids to the playground. It was a beautiful day to play outside. A few minutes after we got there, a friend from church walked over with her three kids, so I started talking with her. While we were talking, I still made sure that Logan and Taylor stayed within eyesight, and that Kendall wasn't trying to go down the playground equipment by herself. I got distracted by my conversation with my friend for a split second, when out of the corner of my eyes, I saw Kendall trying to climb down the equipment, on her belly, feet first, as she would going down the stairs, at a height of about 6 feet. I ran toward her to catch her, but it was too late! She landed on her back in the wood chips. Of course, she started crying right away. It took me at least 3-5 minutes to calm her down. Once she had calmed down, I made sure that she could move her arms and legs. She seemed okay, and went back to playing a few minutes later.
But the thought of what could have happened haunts me. She could have landed sideways, and broken one of her arms. She could have landed of her feet, and broken both of her legs. She could have hit her head on the pole a few inches away, and been knocked out, unconscious. Worse even, she could have had serious brain damage as a result of the fall.
I will never, ever, let something like this happen again. Accidents happen fast. I can't afford to be distracted, not even for a split second. I can't risk my children's safety and health. Kendall was blessed yesterday. It was as if an angel caught her, softening her fall. I feel so blessed that Kendall didn't get hurt at all, and that she is 100% okay today. She is so precious to me. I don't want anything bad to ever happen to her. I will be right there, all the time, to protect her.