Since you are seeing watery stools with the possible presence of blood we need to identify the cause of that and begin treatment. Check with your veterinarian and see if you can drop off a fresh stool sample for testing or if you need to take her in. Besides the standard "worm test" your vet should also consider testing for protozoa and for bacterial imbalance of organisms like Clostridia or Campylobacter. Most intestinal infections that produce watery or bloody stools are affecting her appetite some even though she seems to feel good. I would suggest trying to change her diet after the other problem is resolved. Click on the Doctorpup.com Forum and search "Food" for some other member questions and answers. There are also a couple articles about disturbances of the GI tract and about Giardia and Coccidia that might be useful.