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If she is breathing, eating and drinking well, you can wait and see the vet tomorrow.
Scrubbing her bottom on the rug is probably from an overfull or infected anal gland. They scratch to relieve some of the pain that comes with it. Your vet can express the glands and get her some relief.
I would worry more about the wounds. These could be anything from an injury to a lick granuloma.
You should see your vet tomorrow for a diagnosis and to discuss your treatment options.
Let me know if you have more questions about this.