Hello David, I'm Dr. Deb and will do my best to help you today.
I'm sorry that Freyee has injured herself.
Hopefully, she has just pulled a muscle or experienced a sprain/strain and with a few days rest and medication, she'll be fine.
The following would be my suggestions if this were my case:
1. As long as she's not vomiting and isn't currently taking any other non-steroidal anti-inflammatory drugs or steroids, then she could be given Aspirin at a dose of 10 mg/lb twice a day; this drug should be given with food to avoid stomach upset.
Another option would be Paracetamol (Acetaminophen) at a dose of 5 mg/lb twice a day. Care should be taken, however, to avoid access to any cats you might have since this drug can be toxic to them.
2- Rest her for the next 2 weeks; no running or jumping. If she is better within a few days continue to rest her for a total of 6 weeks. Activity should be limited to urinating and defecating on a leash when she's outside.
So, even though she might want to go for walks, I'd avoid them for now.
If you have stronger anti-inflammatory drugs than the ones I mentioned above, please let me know and I can provide the dose.
I hope this helps and that you see improvement soon. Deb