For pain you can go ahead and give her buffered asprin. The correct dosage is 5mg per pound of body weight every 12 hours. If this does persist, you really should try to see a vet with her. You can see if you qualify for a pet medical loan :
www.carecredit.com
You can also put an ice pack on where you think the injury is. Good luck and I hope she feels better soon :)
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