Hi Pam,
I'm 11 years old and I have 5 dogs. I think Its a terrific Idea that you seperate your dog/dogs while their eating time. I always seperate my dogs while they are eating. Well I don't know why your dog picks at her food, But my Dads dog Captain is a 5 year old English Cocker Spaniel and when ever I feed him he he nevr eats. You know why? I did some experenting and I decided he Hates being watched while hes eating Well I hope this helps you!!
Amy