Ok first deep breath three weeks is nothing for them even at that size I just had a hatchling that Dropped her yolk not eat anything at all for 5 weeks no weight loss and she ate unassisted just fine twice now. Offering F/T might be the issue you might offer live and see how it goes, Assuming all your temps and stuff are right.
P.S. Assist feeding is an uber last resort for experienced people only! I doubt you'll get it to eat now after a failed assist feed..Give her another few days and offer live..
also 10 Grams is a good poop which they do right after they shed so the weight loss when their that small is most likely due to poop.
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