Hey Bonnie - I'm really sorry to hear about what happened. That is really unfortunate and a major downer.

Practice certainly helps a ton when it comes to clipless pedals, but all it takes is one time for you to slip up and you could have serious consequences - particularly when dealing with traffic. I take extra, extra time and space in busy street crossing while clipped in - it isn't a guarantee, but at least I feel as if I can't clip in on the 2nd or 3rd try, I can still get across.

Hope you get better real soon - I was hit by a car a week ago today - it is no fun at all!

Best wishes