Ok everyone... she DID keep the harness on but somehow got it on upside down. She took a nap UNDER the bed and when she awoke, she climbed out from beneath the bed with the E-Collar trailing under her tail!

TECHNICALLY she didn't get it off. I removed it. If she was that good to remove it from her head, no matter what I did, it wasn't gonna stay on. Thankfully the cast is a lot higher up her leg than the other one. Its still on, and I have good hopes it'll still be there tomorrow morning.