Eating frustration ... Ugh

For two or three days, Olivia has been drinking 3-4 oz of her Pediasure consistently at a time. At those rates, I have a chance of actually getting her all the way off the NG tube. However today, she has decided to drop back down to 1.5-2 oz consistently. Argggghhhh!!! Hopefully the latter is the fluke and not the former. /sigh