Awe, poor girl! Sometimes chickens can be so mean to each other! Drives me crazy lol. I wish everyone would just live peacefully!
It worked great for me! I wish I had a picture of the ones I made, they were pretty simple...something like this (found this pic online). I made them out of scrap material, elastic, and some velcro! Its been a few years, but I can't remember ever having it leak on me, or fall off and I've used diapers on 2 separate roosters! I had a few layers of cloth in the poop part to help keep the liquid inside. I've also seen people use feminine hygiene pads inside, which is quite smart...that would make cleanup a breeze!
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You definitely want more than 1, I had 3-4 so I could change it as often as needed. I just hand washed and then hung to dry.
I also recommend having a place where she can be without the diaper. During the day if it was nice out I had a little pen for my guys on the grass so they could just be chickens scratching and finding bugs! And inside I had a little dog kennel set up that I could put them in with a roost and such.
It was fun having a house chicken, you really bond with them in a different way than chickens in the yard! It's a bit of work too, but wasn't really anymore work than a dog or cat haha. I think one of the funnest things I did was take that little guy to pet stores and stuff. He would just ride on my shoulder like a little falcon, and got lots of attention from shoppers! Good times...
Good luck with your little girl!! She sounds sweet, and I know she's lucky to have such a loving human parent