When you entered the info on NV's website, did you put in her current weight or her desired weight? Make sure you put in her desired weight. You want to feed about 2-3% of her desired body weight. Of course, if on a weight-gain diet, then you add more.
My Wylie is 6.5 pounds and gets about 3.5 medallions per day. Marcel weighs 3 pounds and gets just under 2 medallions per day. Depending on how their body feels, I adjust from there.