I didn't get any pics or actually see our daughter working with her, but she says she now leading very well w/o a butt or body rope!
I'd prefer that it be kept on - in an unforeseen incident it does help, IMO, if a foal goes up and over backwards/sideways - to protect the head and neck. She's still less than a month old...
On a different note - her dam is taking "Chylly"s handling well - and getting her first riding sessions. The first pic she is tied up still (or this may have been when Gwen was done "riding" and just sitting...)