No problem re: the typos! : )
I'm glad she's an indoor cat only; much safer for her.
Thank you for sending the pics. It's a little hard to see clearly.
Do you mean, 'will the cartilage grow back?'
Typically, this type of condition is caused by external parasites like fleas/mites and even though she is indoor only, humans can bring these inside, on their shoes and clothing. Scratching a lot, can cause these scabs, she could have a fungal skin infection called ringworm, or she could have a certain type of mange mite that can cause itchiness and loss of hair in the area, like ringworm.
At this time, it would be advisable for her to be evaluated in person by a vet, so you can get a definite diagnosis and she can be treated for the condition found. It's always possible that the cartilage could grow back, but, it's also possible that she could have a 'tattered-looking' ear for the rest of her life.
I hope you're able to get her seen by a vet as soon as possible, so this area doesn't become infected; if it is infected now, or to prevent infection, the vet might prescribe antibiotics, if it is found to be a bacterial infection, but it could also be a viral or fungal infection.
For now, you can continue to apply a thin film of plain Neosporin (without the 'pain' component) to the area with a Q-tip, so you don't touch it with your hands. It is not harmful if she licks it.
I hope all will be well with your Rally!
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