Elsie J. Oxenham 
Schooldays at the Abbey [EPUB ebook] 

Mac Donald visits the Abbey for the first time, because it was once owned by the father of her Uncle Tony. She discovers she is fond of the Abbey, but even fonder of its current occupants Joan and Joy–so she is distressed to think they might actually lose the Abbey–to her! This book is important in because it introduces Jandy Mac for the first time, and we get to see Joan and Joy in a positive light.