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Hello, I'm Dr. Deb and will do my best to help you.
I'm so sorry that Starr appears to be in so much pain. It's quite possible that there's an issue with her spine where there's compression of her spinal cord by a disc or mass if she's excessively vocalizing as you've described. There aren't too many conditions which could cause such significant pain in a dog this age.
Of course, if she somehow broke a bone, then she could be in this amount of pain but typically, a great deal of trauma/force is required for this to occur. Jumping down from a chair to the floor shouldn't be sufficient amount of force to break a bone.
I would have recommended that you give her a low dose Aspirin as well since it does have pain properties but it may not be enough if her pain is that severe and/or if she has a disc issue.
If at all possible, I'd have her seen so that at a minimum, stronger pain medication can be dispensed. It's possible that a thorough exam will revel the problem or x-rays may be suggested if a disc is suspected. X-rays aren't always reliable in diagnosing disc disease (MRI's are better) but they can be useful and a good first place to start.
I hope this helps. Deb
I'm just following up on Starr. How is she doing? Deb