It might work... her backstory is strange, but I suppose Cornell might just change it, being a reboot and all....
Keep in mind, this is taking place hundreds of years ago. Immortal or not, I'd imagine a few hundred years is an awfully long time to stick with one thing. It's also possible that there was some sort of internal conflict which led to a schism within the group, or something.
*edit - Cornell has posted the following tidbit of info on his blog:
yes, there would be a Century Babe, wouldn't there? (They're not all called Jenny, though.)
Which seems to be a pretty blatant admission that yes, a Spirit of the Century is in Demon Knights, but not necessarily named Jenny.... interesting...
The concept of Century babies kinda ironically may see a lot more use in the DCU than it ever did in Wildstorm. And it kinda defined the WS universe, so that's saying something. Wildstorm was all pretty much set in the 20th and 21st centuries, so we only saw 2 Spirits developed as full characters, Jenny Sparks, and Jenny Quantum. We saw a few more general Century Babies, Elijah Snow and Axel Brass from the 20th, and River Baldwin from the 21st. We got ONE issue of The Authority that showed some previous spirits of the century, and only Jenny Steam and Jenny Crusade had much more than a cameo. But with Demon Knights being set in the middle ages, All-Star Western in the 19th Century (Jenny Steam!) and Legion in, what is it, the 31st century? we could have multiple Spirit of the Century characters and Century Babies in use at the same time.
Jenny Quantum and Jenny Steam explain, a bit:
[Edited on 20/9/11 by Bamfette]