Berta Ruck 
His Official Fiancee [EPUB ebook] 

One of the most amazing things about this book is that it was written in 1914, yet resonates as a modern-feeling, romantic story somewhat along the lines of Sandra Bullock’s 2009 comedy The Proposal. It doesn’t feel dated. Perhaps you can find the odd, quaint expression here and there or a few old-fashioned limitations on the male-female relationship, but the heroine of this story is a very sassy, smart, independent-minded female. (Goodreads)