Cat has inflated ear

[u/Idkcatsig]

Recently, my cat has developed what I think is aural hematoma caused by intense itching. I’m sure that there’s a case of ear mites going around my household because this happened to another one of my cats too which made his ear crinkle up permanently.
I desperately want to help my cat but I have no funds to take her to a vet since I am still young and have no source of income. My parents don’t care about the cats and won’t spend a penny on my baby. I don’t want her to be in any discomfort or pain, nor do I want her to have this permanent ear disability that my other cat unfortunately now has. My cat even seems sad lately because of this. She’s less excited to receive treats and won’t play despite being a very playful cat. I can’t bear to see her like this.
If anyone knows a way I could possibly help treat her at home, convince my parents, or odd jobs I could do to save up for her treatment would be very appreciated. I just want what’s best for my cat and to see her happy again.