But I did notice this thread is currently categorized under the Hermann's, and should be moved to be in the Greeks section. Greeks have the random black spotting on the belly, while the Hermann's has two black stripes.
Do you soak her in tap water? I've noticed sometimes my babies have little white or grey lines around their carapace and plastron and I'm thinking it's from what could be in the tap water. They get distilled water in their enclosures, but I don't soak them in it.