Does it have to be historical? If not, I very highly recommend the Chief Inspector Gamache/Three Pines series by Louise Penny. Little violence, no sex,
Well you are in luck as most historical mystery series are not sex-filled. Start with Ellis Peters and Cadfael, she'll love those. Laurie B. King who
Harry Dresden series
Miles Vorkosigan series
and a coupla non-sff
What he said. The First Law series are some of the best-narrated books out there.
LOL cheers mate