Karen, you might try dosing your mare with B-1
which acts as a calming influence, maybe at the half way. And the more
experience she gets, the better she should be. Also camp as far away from
the vet area as possible so the 2 horses cannot feed off each other. Get
her use to your signals for calming down and relaxing too. You will have
to figure out what will work, for my horse, stroking her face, rubbing her neck,
crooning (all my friends shut up), rubbing her ears, all those signals tell her
to relax.
The other thing to consider is go to a ride without
her buddy and then see what happens. Then you will know for sure that
having a buddy in camp and not on the ride is the problem.
Jeanie