I can find out very little about Mary Winifred Boggs (1874-1931). She also wrote under the name 'Edward Burke': see My Wife. Her novels were published in the USA, Spain and Argentina.
Sally on the Rocks seems to have been first published in 1915, but no details are given in Jisc of the publisher or number of pages. The edition published by Herbert Jenkins is not dated in Jisc, but the address of the publisher in my copy is Arundel Place, not York Street. The copy of Netherleigh dated 1916 also has the address of Arundel Place, so I suspect that this is an reprint of the novel published in 1915 rather than a later reprint issued in the early 1920s. The adverts on the back panel are also in the style of novels published around this date.
Bibliography code: JEN-15.1
Publisher: Herbert Jenkins
Binding: green cloth with title in black at top; by the Author of
The Sale of Lady Dventry at base, with a black line round the egde; title, author and publisher at base on spine in black
Size: 182 x 115 mm
Dust jacket: signed Bl, lower left in papers the woman is sitting on
Internal illustrations: none
Price: 2 shillings over 1 shilling 6 pence
Printing history: Popular edition.
Printed by: Lve & Malcolmson, Ltd, London and Redhill
Dust jacket (click to enlarge)
Notes: This is a later impression, as novels published after the first edition, such as Netherleigh are advertised on the rear panel at a price of 1/6d.