Sounds like you did well! The most important thing might be to keep her drinking. I had an old 33 year old with mild colic this week, due to not eating/drinking in the heat. I ended up using a paste wormer to get some table salt mixed with applesauce into him; it made him thirsty. Vet also brought me some electrolytes and recommended that we add those as well. I would bet that you're right, it wasn't colic - I think she got too hot. However, if she wasn't drinking, or her body was too stressed from the heat, colic might be next. I think you were very wise to stay on top of it like you did!