Autumn Wind--the second day

Since the little colt had trouble with the heat on his first day, I decided to put him & Meg in the barn the next day. I fixed it up so they also had space in the aisle way and I put the two big box fans running in the stall and aisle. Autumn Wind had a good time exploring the new space and Meg settled in to eating her hay. All was well.
Until late afternoon when Meg started to colic. I had no reason to know for sure, but really believed that it was because she was in the barn. I gave her a banamine shot & moved them back outside that evening.
The next day, I finally had time to call her former owner and was telling her about Meg's colt and the ensuing troubles. The former owner said "Oh, we never could keep Meg in the barn as she would always colic. We had to keep her in the pasture all the time."
Well, gee. It sure would have been nice of her to tell me that so I could have saved Meg & myself a whole lot of stress.