Re: Daughter eats non food items....Pica?
I know my son was a paper eater for a long time, I still catch him nibbling on pieces of paper every now and then.
Perhaps your daughter has a defincey, sometimes children especially babies and young toddlers who are lacking something start eating weird things.
I remember when I was pregnant, I was filling out a paper and it asked me if I had cravings for paper, cigeratte butts, ice cubes, glue...and a bunch more weird stuff. I asked my doctor about that question and he said that pregnant women who are lacking certain nutrients get cravings for those things since some of them have those nutrients.
The same goes for children I guess. Anyway I'm sure your doctor knows this, other wise he wouldn't be putting you through all those tests.
In the meantime since your daughter is 2yrs old, why don't you start her on vitamins. It can't hurt, and maybe she might stop eating odd things that way you can have a head start to see if she is lacking something in her diet or if it is just a stage.