It does look like she ate something that didn't get digested. Definitely check around and see if you can find something that's been chewed, but you probably won't need a vet if your dog is otherwise drinking, peeing, and pooping normally. Just keep an eye out for any abnormal behavior.
We see poops like that after the dogs have gotten to the bird feeding area--cracked corn looks like that, but it's usually still hard when it exits...
Oh, and if you get a chance, we'd love to see a few pics of your dog, too