Can you see the cracks in Lea's shell? Any idea as to cause? Cures?

Per TigsMoms suggestion, I have been brushing Lea's shell, lightly with a soft toothbrush, in an effort to remove the glitter so it doesn't end up in her soaking/ drinking water. Today, I noticed what appear to be cracks on her shell. We have an appointment with a vet tomorrow, but I'm a bit freaked out. Not sure if they were there when she appeared last week. Thoughts?

Per TigsMoms suggestion, I have been brushing Lea's shell, lightly with a soft toothbrush, in an effort to remove the glitter so it doesn't end up in her soaking/ drinking water. Today, I noticed what appear to be cracks on her shell. We have an appointment with a vet tomorrow, but I'm a bit freaked out. Not sure if they were there when she appeared last week. Thoughts?
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