stool comes in all shapes and sizes, she could be constipated, we can get little tears down there also excessiive wiping and hemorrhoids can cause some bleeding. if shes worried she should go get checked out good luck
Make sure she's getting enough of the right kinds of fiber (apple peel is the wrong kind, for example) and doesn't strain when using the bathroom. She could have an internal hemorrhoid. A doctor would clear this up in case it's something else.