I am so sorry to hear about Kelsie. Is it a LP issue and/or did she tear her ACL? The only reason why I ask, is I know ACL tears are very painful.
I can only offer what happened to Kara, she tore her ACL, which was very painful, she also had LP's. After doing what you are doing, rest as much as possible, no bare floors, as much as possible, and all they told you, plus they put her on Cosequin. She did fully recover from her ACL tear, with this method and had no residual problems from her LP's. When this happend, we were referred to an Ortho specialist, who is currently at our vets office.
Leo was just diagnosed, grade 2 LP. We noticed he was holding up his back left leg. We immediately made an appointment with Dr. C. and he put Leo on Cosequin. He does not want to operate on Leo, at this point, and wanted to see how he did. Leo, within days, stopped holding his back leg up and is prancing around once again. Dr. C. measured the muscle mass on both of Leo's back legs, and they were even, which to him, was a good sign that he is not favoring either leg.
There is a girl at the office, whose shitzu had the same situtation, however, after taking all the necessary steps, her baby did have to end up getting surgery, and did beautiful. Dr. C. performed the operation.
I see you are in NJ, if you are in South Jersey, I would be more then happy to send you a link to my vets office, where Dr. C is the head of. I ADORE him. It's an option for you, in case you do need a specialist.
Thinking of you and sweet Kelsie.