<< Is it possible that she abruptly stopped growing and is pulling herself off
the amount of food has had up to this point? >>
No. Introduce probiotics, check all around inside her mouth, get the worming
done, try some low doses of sodium bicarbonate (ulcers), check for
lesions/infections in the throat, take a blood test that includes chemistries,
enzymes, cell counts and t3/t4, keep fooling around with feeds. That's the
first step.
ti