Part of it may be the way she is trimmed and part may be that she has just never learned to extend her trot. :) or she may just have a miserable trot, but I doubt that.
Well, it just bothers others. I don't know what I do but I've figured out how to go with her and get her a certain speed. I can't explain to Eddie though. I just rock the reins back till she's good. It's one of those things that you just do but can't explain and you find it caz it's too uncomfortable not to. I feel like I'm rambling. I hope this makes some sense though.