We just aren't sure if the canter issues are medical or just a wiring/muscle memory problem.
If I knew for sure, this situation would be easier to call. Jumping, being a canter stride in the air, would help her learn to canter... If she was physically capable
, which we aren't sure about.
So maybe let's do it like this?
Once a week, I do trot poles under saddle as JustDressageIt suggested. I will take videos for critique and do some research on engagement.
Then, after trotting poles successfully for some time, maybe we'll try canter poles. If those aren't an epic fail and she proves physically able to canter properly, we proceed to canter poles and small (18" or less) jumps at liberty once in a blue moon.