Unfortunately, Lisa has leg problems and Vertigo with would prohibit her from wearing stilts. I also can't bring the fabric up, because the other patterns on the side pieces have to line up with the designs on the back train in a specific way. So I don't know of a way to remedy the situation other than just cutting the bottom of the side trains off at about the right length. I only have one or two pics of the bluray with her walking away from camera, dragging the sides behind her, and the Whole planet is red, making it hard to clarify the length, shot to shot. I know how animators sometimes fudge things, it makes it hard to get a good reference on certain areas of costumes.
This last one has her walking away in a cave, less red but it's right before a camera angle change; so I don't know if it helps my case. lol