I feel like she thinks she's restricted, she's 13 and had been to just about every type of pen. We're running today and she shut down again.
Posted via Mobile Device
Have you tried, after warming her up, letting her just breeze the outside of the arena and let her open up without turning barrels? My old mare was so hard to break of this habit. We ended up not running her barrels but instead ran her poles and gamed on her. I think her issue was she was bored with the same thing all the time. She really competed and opened up when I switched her.
Maybe try some different patterns in the arena with the barrels to help her break the same old same old.