I have no supports or parents and I don't know how anything in this game works or what I'm doing. I'm just farming fans for the mission. Why did she get S in Mile? Isn't she medium-long distance horse? I only ran a few Mile races after I noticed she's now S in it.

Probably something to do with her parents, but I've been using the same horses as parents in all runs and she didn't get S in mile before. I think.