Try rolling towels around the sides of a carrier, and laying the bunny inside. Its critical that she doesn't roll, as she could easily get a life-threatening injury. Be sure she's eating/stays hydrated and get her to the vet ASAP. It could be a number of things incluiding E. Cuniculi, or a middle or inner ear infection. The tooth grinding means she's probably in a good bit of pain. When one of mine had head tilt, we stayed up night with her to hold her and keep her from rolling. How bad is the head tilt?