You where correct.......The corona vaccine was totally unnecessary...........good for you.....
....You have to be on top of this for Hannah. Vets tend to be of the mind set that all vaccines are good and the more the better......sad.....
This is a guide that is nice to follow if you need a place to start....
Vaccination Schedule Recommendations For Dogs
This is a nice site to start for liver issues....
Canine Health Problems
Hannah's liver is already compromised .......That includes all vaccines, and flea and heartworm products...The kidneys and liver are filters for toxins in these products so it's important to be careful for her......
These sites might help understand vaccines.....
Truth4Dogs Revaccination Vaccination Danger - Dog Health Report - Dog Care - Dog Health Problems Solved! Canine Vaccines and Vaccination | Dog Vaccination Schedule
Good luck and I'm glad to see Hannah is doing better......