yeah get her in and do me a favor call dr centers tomorrow please she consults i believe for free as if this were mine due to mine having similar bile acids with no issues like this I would question being on clavamox and lactulose is really necessary at this point as she needs to be drinking water and sounds like your vet is not real up on liver issues
and sounds like she has declined since being on those three things - could be coincidence but not sure she really needs that stuff right now. I think she is going to need steroids more and if she did have a seizure just now that should not have happenedon lactulose and clavamox as those should be detoxing her so why i really feel this is neurological but needed liver shunt ruled out with bile acids and now that those are low i feel that is ruled out at this point
I really feel the neurologist is going to know exactly what is going on with her
did your vet ever xray her to make sure nothing spinal,etc? If not do not let her at this point just wanted to know if she checked that - if not just have specialist do it all you need to get this diagnosed and quickly