Have you tried the sending method with her? I used to have difficulty loading my colt sometimes but now that we've got the ending method down, I point and he hops right in without hesitation. It's like sending them in a half a lunge circle, then yielding their quarters on the opposite side.
That, or the lunging method. Lunge her in front of the trailer then motion her to go in. If she refuses, lunge her again then ask again. Any time they think about going in the trailer with forward motion, let them rest. If she refuses by stepping back, lunge her again. This video kinda shows you an example. It's not the best. Henny was fidgeting around then decided to eat some rocks, so I was more focused on him at that point LOL. 014-14.mp4 Video by kayella_kairos | Photobucket