It looks like a minor cut and the white stuff could be urates from when she peed and slithered around on it. I would wait till after she sheds and see if it goes away. If not, we can proceed from there.
Edit: I would stop the betadine. Give her a regular water soak and then wipe her down and leave her alone till she sheds. If its still there or gets worse, than continue betadine.
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