It's probably her knee, but LCP is also possible. The pain would be a major concern. Usually dogs with LP don't show so much pain so quickly. What about a CCL tear? Also, whenever they don't want to jump, are depressed, etc., the spine also becomes a concern.
Her being depressed with the other symptoms does indicate that she is in a fair amount of pain and needs to be seen as soon as possible. Because she is walking funny and doesn't want to jump, she should probably be crated until you see the vet. Jumping, running, playing, and even walking can makes things worse in some cases. Please get her to the vet today. If nothing else, for pain relief...
BTW, some of these things are relatively easy to diagnose. If you aren't satisfied with your vet's answer, then she will need to see an orthopedist.
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