"its to late" could be a good reason, but none other that i see are very good reasons... if its windy, or rainy, or jsut not perfect, all the more reason to work with her! :) just to get her used to listening even with distractions, and to keep you focused on her too. :) it doesnt matter what feeding time is, i wil work my hrose anytime, mind you i dont like to inturrupt her feeding, because i dont liek doign anythign when im hungry, but it also shows her that no matter what the problem is, she needs to listen to you. :)
If there are no horses in heaven... im not going.