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The only special care is to protect the area so that it doesn't start bleeding again and it doesn't hurt too much. Cold (cold wet washcloth) helps decrease the pain. Keeping her quiet (in a crate if she is used to one) would help prevent her from hurting it again.
She may limp for a couple days until the nail bed cornifies and gets hard.
Most ripped off nails grow back normally.
Let me know if you have follow up questions.