Historical Epistolary Fiction recs!

So my favorite genre of books happens to be epistolary fiction,more precisely historical epistolary fiction.
However,I recently have had trouble finding books in this genre,that also fit my preferences.

I prefer the main character to be a girl,there to be very little to no sex,and not a lot of detailed violence.

I have already read dracula and potato peel society. My favorite books are those in the Dear America,Dear Canada,and the Royal Diaries series.

Thanks for any recs!