It does look stunning on her!

Laura, when I start a new cat on the harness, the first time the harness is on the cat is 'paralyzed,' can't move at all. That stays on a few minutes, then comes off. After a few times, the cat starts doing this snake crawl, can't stand with that heavy weight of the harness! It takes time for them to adapt. After a while, they put on the harness and just keep motoring!

Given Amy's situation, I think you just need to give her time to adjust to it.