Looks like a little cement patch on her shell.
The Coluber populations here are now intergrades from years of accidental/inadvertent introductions of mainland Southern Black Racers coming in with landscaping material/plant shipments from central Florida.
Also entered into HerpMapper
Terrapene carolina baurii
Not 100% sure on ID. The shell is very deeply ridged which has me leaning towards Alligator, but it could be Common.