She is magnificent, like all the others Camponotus. The spines on the front of the Pronotum makes her looks like a Polyrhachis... I've never seen a Camponotus with such spines. There are no spines on the petiole so I presume it's a Camponotus... Where did you find the nest ? On a tree, were the worker fourraging alone ?
Cyndy Parr set "Camponotus sericeiventris" as an exemplar on "Camponotus sericeiventris (Guérin-Méneville, 1838)".