<She got offended by him for no reason and the fact that she doesn’t want him as a Rabbi after all that he did for us shows that she is judemental and unappreciative.>
Gratitude has nothing to do with comfort with a person. In fact that’s the whole point, a person needs to show gratitude even to someone they can’t stand. I hear nothing that says she isn’t doing that.
If I see anyone being judgmental it’s you.
Since nobody on this board knows what the rabbi actually said, it’s hard for us to know if it was nothing. But know that people today in general are very thin skinned. So if it was over nothing, nothing new about that and no reason not to continue with her.