Ok. still don't know what the issue is. Are you saying you're afraid of pushing your horse to work harder because you think it may hurt her?
I don't know? Set a goal of we will do 'X' for this ride and just do it?
anyway, best of luck sorting it out.
ETA: ok just read the other posts (I got caught up in something mid post and missed the most recent replies)
This sounds like a case of sucking it up and just doing it. However, this approach does not work for everyone, so perhaps a sports therapist is in order.