Thank you for the reply.
It is hard to tell if the situation you are describing is neurologic or orthopedic in nature and it can sometimes be a challenge to differentiate the two, but it is definitely more than her being lazy!
I would start by having a thorough physical exam performed, including a neurologic evaluation of her nerve reflexes - preferably with a new veterinarian. If there is any spinal issue that is involved, the results of the neurologic evaluation may help to locate the area involved. I would also have xrays of the spine and hips taken. Spinal disorders may or may not be visible on an xray, but if there are degenerative joint disease changes (arthritis), they may be seen. If the symptoms you are seeing are secondary to arthritis, you may be able to help her with medications or supplements that are designed for joint support.
In the meantime, I would not offer her any over the counter pain medications that you may have access to as most are not safe for use in cats and can actually be harmful. If, after an evaluation, it is believed that some of her symptoms are due to pain, safer and more effective medications can be prescribed.
I hope this is helpful. My goal is to provide you with excellent service – if you feel you have received anything less, please reply back as I am happy to address follow-up questions. Kindly rate me when you are done. Thank you for allowing me to assist you.