I think there is little doubt that the Dorothy May GAMBRILL who married William Willoughby TURNBULL is the same woman who married Benjamin GAMBRILL in Kent.
So you have Dorothy May (nee KITE) formerly GAMBRILL who married to become Dorothy May TURNBULL.
Some census material shows her with parents George and Mary (nee EARLY) KITE, living at 2 Rose Hill, Ramsgate, and we have her birth.
Dec 1891
KITE, Dorothy May
2a/919
Thanet
Benjamin GAMBRILL can likewise be found on census records as a stepson of one Frederick W. WISE at 15 Camden Rd. Ramsgate. Ancestry has the records for his time in the UK Royal Navy . He joined in 1914 and finished in 1926.
Please note, my finding of the death of one Benjamin E GAMBRILL was not the husband of Dorothy. (Will edit)
There are some newspaper snips for the couple. I am not able to seethe full content, but perhaps someone else will.
The essence of them-
ALLEGED DESERTION
... Yesterday, the Ramsgate Borough Bench adjourned for a fortnight a case in which Benjamin Gambrill, leading stoker on H.M.S. Droadoonght, was summoned (by) his wife, Dorothy May Gambrill, who alleged desertion. Mr. Marchant, solicitor, appeared ...
Published: Saturday 31 May 1919
Thanet Advertiser
Two birth notices with correspond to the births I have detailed above.
BIRTHS. June 7th, 7, Salisbury-avenue, Ramsgate, the wife of Benjamin Gambrill, of daughter.
Thanet advertiser 1914
BIRTHS. GAMBRILL, January I9th, 34, Plains of Waterloo, the wife of Benjamin Gambrill, of son.
Thanet advertiser 1916.
Sue