I can't really see a reason for a Standardbred racing barn to train something like that but you never know I guess. Maybe she is just revealing her sense of humour for me...
Could you teach her to long line maybe? It would build up some muscles without having her straining to do circles all the time plus it adds variety, don't know about your horse, but when mine gets bored he gets naughty.
Or inhand walk her around cones or something like a slalom? To teach her to bend around things but slowly? I dunno, I don't deal with youngsters