Ok... I didn't even know it was a she, I thought because the claws were short it was a male... And the rust is just a pan I put her in, her tank is not dirty, but she has been shedding. A piece came off earlier today from her shell. I scrubbed the shell, and let it dry for twenty minutes and here is what I got.

The second is where you can see another piece of the shell pealing off.