it has to be nerve racking to be going through all this, especially since you are trying to do what is best for your child and the thought that those actions might do the opposite, make you angry at the medical profession. There are no physicians at this forum, but the gastroenterology section does have one. Not sure how long before questions get answered, though. Sinve we are all patients at this board, we can not give any medical advice, only opinions and suggestions. Good luck to you.
The hepatitis A vaccine is not live so it is highly unlikely your little girl got hepatitis from it. The side effects you describe happen sometimes but usually don't last more than a few days. Maybe it's the age of your daughter.
You seem to be taking the best course of action by taking her to the Children's Hospital tomorrow for a professional evaluation. Giving the fluids she craves seems like a good idea. Did you get any of the blood tests back. I assume she will be given a full health panel, including CBC, liver enzymes and maybe a thyroid panel. If not, ask for them. Sometimes these hospitals are stingy with the tests.
All the best and let us know what the doctors say. I don't think it's serious as little kids sometimes hang onto these things longer than us oldsters.
-- Jim