Sorry RamaMama for not being able to help sooner.
As long as she is urinating I wouldn't be as concerned about that.
The lack of appetite is concerning as it's a clear indicator of 'something' going on.
Personally I would be more concerned about the breathing issues. It could indicate a progression of the 'odontoma'. ????
I realize that we are speculating about the odontoma but the symptoms do indicate it.
With the odontoma, infection is always a concern. I would treat her with Clavamox. It will address infection in the sinuses associated with odontoma and would also treat a UTI if one exists. I would definitely discontinue the Vitamin powder until things settle down. I don't supplement with the vitamins although I will occasionally sprinkle a little calcium carbonate on the food.
I wish things could settle down for our Costa Rica friends.