There is a very negative stigma attached to kids with ADHD, so I am sure she is somewhat embarrassed. She wanted you to meet them, and get to know and love them, is what I am thinking.
I hope we don't scare you, but just prepare you for what may come along with the child. As Reggio said, it's nothing to be afraid of; just aware. I would have continued to work with the child I mentioned, were it not for his parents. When his mom went on mat leave, I breathed a sigh of relief and was conveniently "full" when she came looking for care again!!