YES, Claire has curly hair. I've written about three million words saying so; you can probably take my word for it.
NO, she does not have corkscrew curls. Read back through those three million words (take your time; I've got a lot of patience [g]); does it _ever_ say, "I twirled one of my corkscrew curls around my finger?" "Curls corkscrewed out of my head like Christmas ribbon?" "I hastily thumbed my long corkscrew curls back out of my face"?
Geez, Louise, people. She says things like, "My hair was standing out round my face like a bramble bush." "I pushed drifting hair irritably out of my face." "My hair was standing on end." Where are you getting corkscrew curls out of this?
(Just as a historical note, corkscrew curls are pretty much 19th century. I think y'all are thinking Melanie Wilkes or something.)
Anyway, as a purely technical observation, nobody _has_ corkscrew curls. People who have curly hair (or choose to curl it with irons or whatever), can _get_ their hair to do this, but it's a deliberate styling, not the natural way the hair goes. And as I say--corkscrew curls weren't a fashionable style either for the 18th century (you'll see small clusters of them as part of an elaborate wig, maybe) -or- the 1940's.
"Bob," btw, means "bobbed hair," and while the original bob, from the Roaring 20's, was indeed a short cut, about ear-length, by the '40's, a longer bob, about shoulder-length, was also common. It just meant a blunt cut, and not trailing long hair.