OK, folks. Mission accomplished. I removed the pedal, pushed a pipe over the crank and bent it back. I think I got it right by matching the distance between the end of the crank on that side to the down tube with that on the other side. At least it's symmetrical now, and it feels a LOT better. The lesson here is that it's really not that hard for the crank to have gotten bent. Maybe it wasn't a truck that ran over it. Many thanks! The crank was VERY springy throughout the bending process, so I'm guessing that it's not cracked outright.

I take seriously your warning that the strength of the crank may be compromised, and I'll start looking for a replacement. This is not for racing, so if Lucy pulls the ball away, it probably won't be a disaster. I may give it a few whacks with a hammer to see if it fractures.