Her thorax is interesting. She could be a queen carpenter ant because of the boxy shape. She has no wings which would mean she's mated and looking for a nesting spot and mostly focused on that. But, I'm not totally certain... the angle is a bit difficult.
Camponotus pennsylvanicus is my guess, but it could be some other Camponotus.
The right photo is a queen, the left a major worker.
Lovely girl!