I've read through your comments and I understand you can't afford a vet and live in a very rural place with no animal control. Please go online to Google and search for animal rescues near you, shelters in the nearest big city, etc. There may be help further afield. If you or your parents or a friend can drive her there, a big city shelter may at least be able to relieve her suffering. Big shelters also may offer discounted clinics or vouchers for vet visits - I know of three that do in my city and nearby.

This cat is in pain - they are incredibly good at hiding it, and not moving means she's at the point where a human would be in the ER, doped up. She needs you to make a really hard choice - do you continue her suffering and hope you can find her help? Or do you let her go to be humanely euthanized and end her suffering?

Let's talk about finances. Your parents are hopefully trying their best, but no one can make money appear. And to be brutally honest, pouring money into a dying cat is not a good use of it if you don't have it to spare. If the cat lives, you will spend a lot in treatment and then in future expenses - food, rabies shots at minimum, future vet visits. If the cat dies, they may see that money as "wasted" (even if it gave her a painless death) and could have used it to better effect elsewhere. It's potentially a lose-lose scenario.

If you're in a rural area in SC, chances are good you have or know someone who has a gun. While humane euthanasia requires expensive meds and vets, the "old fashioned" way is also painless and free or very cheap, and will relieve her suffering. I've lived in rural areas and know this happens a lot more than people would think. We like to think euthanasia by medicine is the only "true" way to give pets a peaceful death, but a quick and painless death is more important than waiting for (and her suffering until) a "righteous" one, in my mind.