There are 2 books in the Once a Wallflower series.
The Once a Wallflower series does not have a new book coming out soon. The latest book, Introducing Miss Joanna (Book 2), was published in November 2020.
The first book in the Once a Wallflower series, Presenting Miss Letitia, was published in April 2019.
The Once a Wallflower series primarily falls into the Historical Romance genre.