I just rear-ended someone

This is the first time Ive ever done this in over 15 years of driving. They had been blocking me and I thought they were leaving so I started to back up. Nope, they were still there and I backed into them. I bent in a part of their wheel well. I was flustered and said sorry a lot, and I couldnt find my insurance cards so I gave her my name and number and we went on our way.

I just sent her a screenshot of my insurance card. I feel like I did everything wrong. Is there anything else Im supposed to do?