Has she been tested for giardia? What about a fecal? Any worms?
If you can find nothing that is causing the poo, try a 6 week course of Tylan.
SBD Posejpal's Leyna, HCTs 6/16/2010
SBD Posejpal's Hades, 5/9/12
At the rainbow bridge:
Zappa 12/27/00-1/23/12 You are my heart, my soul, and my best friend. You will be with me always.
Zeus 5/9/12-8/13/12 You taught me strength. Run free.