Well My Daughter Is 7yrs Old And Has Complained Of

Well my daughter is 7yrs old and has complained of her stomach hurting for about 6mon. Her Dr keeps giving her different reflux's med's and it's not working. One time she had strikes of blood in her stool. Today she had a weird color red in her stool it was only on half of it. Could this be blood or something she ate? I know its hard to know with out looking at it. Just need help?