I don't think they choose on whether they're long or short, but more on quality. So, if your form is long but doesn't have quality, then it wouldn't be as good as a short form with great quality, or vice-versa. If her form is long but really good, I think it has the same chances as a short-with-quality. XD;
*shrugs*
I'm working on a pic, but I don't know if I'll be able to finish in time! *nervous*