She would definitely knit in the round, not knit flat on two needles and seam, if she did it for a living. The traditional way of knitting in the round is to use Double Pointed Needles (DPN's). Wooden or Bamboo (which look like wood) needles would look authentic. I'm not sure when circular needles were invented, it was probably around that time, but I'd say they were used primarily for hats and larger things in the round. I think Magic loop knitting and knitting on 2 circular needles are newer concepts.
So, I'd say if you want to look authentic, watch the video in Advanced Techniques on how to knit with DPN's (it's not that hard, looks harder than it is), and get some bamboo DPN's, which look just like wood. They'll look impressive and also authentic, and be nice to knit with.