Hello, Melissa, and welcome to BYC!

Glad you joined.
I too am not a fan of ACV. I think there is a lot of hype about all the amazing things it can do with absolutely no data analysis to back it up. I would not advise using it. I second
@janiedoe's suggestion to offer her water with electrolytes in it. I would put out two waterers, one with the electrolytes and one with just plain clean water. I would also supplement her with a drop of Poultry Nutridrench once a day for 5 days then nothing for a week then do it again. Giving too much can cause diarrhea.
Have you found good videos on how to splint and tape her leg?