I would also have her stool tested for all parasites including giardia.
http://www.beaglesunlimited.com/beaglehealth_giardiasis.htm
"The trophozoites divide to produce a large population, then they begin to interfere with the absorption of food. Clinical signs range from none in asymptomatic carriers, to mild recurring diarrhea consisting of soft, light-colored stools, to acute explosive diarrhea in severe cases."