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I am sorry to hear about Topaz weakness. My name is Rebecca. I am a veterinarian and will do my best to help.
When you say she has a splayed foot, are one or both of her feet sticking out to the side? Could you post a picture?
I see her diabetes is well controlled. When did she last have blood tests? Diabetic cats can develop low potassium, and that can weaken the hind legs. It might be a good idea to have her potassium level checked.
A blood clot or stroke could also be a reason for weak back legs.
If I could, I would listen to her heart, feel her pulses, and probably do some basic blood tests unless that was done recently. Check her gums, are they a normal bright pink color?
How is Topaz? I have not heard back from you; I hope you saw my response. Can I answer any more of your questions?