Hi and welcome to you and Charlotte!
I apologize, I'm at work and only have a moment to post

It would help us if you could get copies of all the test that were done on Charlotte and post the results. I assume that an UTI or issue with the thyroid has been ruled out?
I have to run but I will try to make it back later, I am sure the others will be by to offer their support and advice.
Hugs, Lori