My Firnen was underweight when I got him at three weeks old, and my trusted vet told us to assist feed him until he took on his own (I only had to assist feed him once before he struck on his own).
My theory is that he simply didn't recognize the f/t as food until it was literally in his mouth. If I hadn't assist fed him, his health could have suffered in a way that would be very difficult to recover from.
All this to saw that if she doesn't recognize the f/t as food and you have expended all of your other options, then assist feeding is a good last effort way to switch.
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