I’m wondering if they made the assumption Mom had that syndrome where a parent will seek attention by intentionally making their children sick.
They probably assumed this is what happened with the older daughter - and they gambled with their theory.
Normally - the health of a child will improve once removed from the parent - IF they guess right.
But that isn’t happening.
It appears they are afraid to admit they made the wrong bet on this one.
Munchhausen by proxy is what you are referring to
And I have run into good doctors and I have run into assholes who think they are smarter than everybody. It looks like that is what the “doctor” at Massachusetts is.