Probably died before 1792 2
1 It seems this is a case of the surname mutating from Swindale to Swindle to Swinlah to Swinley!
These are the only Swinlah listed in the whole of the England IGI (they are included as homophones of Swindley and Swinley). I consider it virtually certain that they are in fact Swindle and that Eleanor Swinlah is the Eleanor Swindale who married Matthew Robson in 1787. A John Swinley is recorded as marrying Jane Redhead in Ponteland on 24th August 1795 and a Margaret Swinley as marrying George Jackson in Newcastle (St Andrews) on 17 August 1788. A view of the original Corbridge registers may give more information.
2 Elizabeth Usher was almost certainly buried as Elizabeth Swindale, widow, in 1792.
3 In the Ovingham register John is said to be 'of this parish' whilst Elizabeth is of the parish of Corbridge
If the identification of John Swinlah with John Swindale is correct then John has named his first daughter after his mother.