jenn52: She never finishes her food, unless it's our fresh cooked food
Giardia can cause damage to the intestinal lining, so if you are feeding her kibble, it more than likely irritates an already inflamed G-I tract. I would feed only canned food or homecooked at this point. Also, damage done to the G-I tract, can cause malabsorption of nutrients. Adding a good probiotic/prebiotic to her diet would be beneficial, as well as something to help repair the intestinal lining. We had good luck using a supplement called l-glutamine to rebuild the lining of my IBD boy's GIT.
I have heard good things regarding arabinogalactin powder to maintain the balance of beneficial bacteria in the gut--you may want to check that out. Here's a good site to reference on G-I supplements:
http://www.dogaware.com/specific.html#ibd
Here's a nice article on l-glutamine:
http://www.b-naturals.com/newsletter/l-glutamine/