You said she was the worst in the tub. You could try making a snake hook from a wire hanger. It's not that hard for a corn. The hangers with the double wire top part, that goes over the clothes rod, work best. No sharp wire ends that way. Or you can wind electrical tape over the end. (just make sure no loose tape)
Then you could pick her up and get her out of the tub that way and hold her after she's out of her enclosure. It could be the coming down on her from above that is making her more panicky. Like a hawk going for her as prey.

My Corn is a tail rattler as well. I call her my "rattlesnake"