Did you apply some vaseline or oil to the legs too? The HP is used to help clean and disinfect along with the soak, then as the article shows, slather on vaseline. You can also use an oil like coconut oil, mineral oil or even coat with triple antibiotic ointment.
https://www.backyardchickens.com/articles/treating-scaly-leg-mites-slm-what-you-need-to-know.77376/
What's the Tylosin for? Did she have symptoms of Mycoplasma? Tylosin is generally used to treat respiratory infection due to Mycoplasma.
I'd work on hydration. If she's not drinking well, then tubing or syringing fluids into her is a good idea. Get her hydrated then see if she will eat some wet mushy feed.
If she's not laid and should have, then giving her 300mg Calcium Citrate+D3 once daily for a few days may be in needed to see if she having a hard time expelling an egg.
What did you deworm with?
Is her crop emptying? What does it feel like?