After all that fighting, Odo just talks
the "Female Shape Shifter" into stopping? Hm. Original.
"What You Leave Behind" does have some problems in retrospect, but I'm not sure that's one of them. There were several occasions when the Female Changeling said that securing Odo's return to the Great Link was more important that the entire alpha quadrant-----even moreso once she knew he had the cure to the disease. He agreed to go; she therefore got what she wanted.