Nothing you have done will cure mange. While it may help with associated skin irritation, the mange needs to be treated by a vet. There are several types of mange, and without a skin scraping, you don't know what type she has. Some types are highly contagious and some are not. They also have different treatments. Mange is very itchy and painful. Look into CareCredit, it will allow you to make payments on her vet care, often interest-free. If you can not take her to the vet right now for help, please surrender her to a rescue group or shelter.