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My name is***** and I am happy to help you with Shadow. So sorry to hear that she is not doing well. How long have you noticed that she is wobbly on her hindlegs? Is she acting normally otherwise? Is she eating and drinking, urinating and defecating normally?
Several possibilities come to mind when considering wobbly legs in a cat. Since she is an outdoor cat, the main ones I think of are an injury to the hindquarters or back, or even a head injury, another would be some type of toxicity. Because there are so many things that can cause wobbling in the hindlegs, I would recommend that Shadow be examined by a vet today to determine if there is something that needs immediate intervention, and to help sort out the many possible causes.
Good luck with Shadow,