Hello, I am afraid that the expert you have requested is not currently available. Still I am Dr. B, a licensed veterinarian and I would like to help you with your wee one today.
First, I share your concern about Zoey.
In regards ***** ***** I do think that the state of her liver does need to be assessed. I would note that an ultrasound is a good, non-invasive tool to assess the state of the liver. It would let your vet check for masses but also for signs of enlargement or diffuse liver changes and gall bladder/bile duct health.
Furthermore, if that was a general lipase level that was that high, then you may want to have your vet add a feline pancreatic liapse analysis to her recent bloods (often if we request these so shortly after the lab analyzes her blood we won't need a second blood sample). This will confirm if we have a pancreatitis (which is my concern based on her signs, history, and this blood result). In regards ***** ***** the ultrasound can be helpful here too, as they can check the pancreas (and all the abdominal organs) at the same time they are looking at the liver. And I do think it is a valuable tool here for Zoey's case since we'd want to know if her liver was compressing her pancreas and thus causing this other issue.
Finally, in regards ***** ***** I am glad that you do have her on anti-nausea medication. Still, I would just note that if she has pancreatitis, this can be painful. Therefore, if she has any tensing, tenderness, or is reluctant to let you press on her belly just behind her rib cage, then we'd want to speak to her vet about pain relief (ie Bupenorphine) for her. Otherwise, these plus a light diet (+/- IV fluids if the vomiting is severe, antibiotics if infection is suspect) tend to be mainstay of supporting pancreatitis cats.
Overall, it does sound like you are on the right track since we absolutely need to know what is damaging the liver to cause those blood elevations you are seeing. And the ultrasound will be an ideal next step. It will let you see what is going on with that liver but also let you have a peek at the pancreas to determine if there is an issue here or if her signs are secondary to the liver compressing that delicate organ.
Please take care,