The BBC adaptation that has Cottia definitely aged her up as well.

I vaguely remember hearing that Roman slaves also generally couldn't carry weapons, but I can't find a source...

She's written a lot of fantasy, but my favorites are the Windrose Chronicles, about a woman from our world who ends up a fantasy world and has to join forces to defeat an evil sorcerer except she's not sure if the people she has to join forces with were the people who kidnapped her and brought her to the other world.