This morning I picked Dawn's feet again - much more carefully this time! This time, I put her on cross-ties, which is what I should have done in the first place. I was a bit nervous, but she was fine. It's always a good idea to be somewhat more careful around Dawn than other horses, because she is so reactive, but I didn't want to start tip-toeing around her, which might make her worry and lead to bad things. So I needed to get back right away to doing the regular things I do with her.
All is well, and a big thanks to everyone who sent good wishes!