There is also an immigration record of a Mary Turner emigrating to USA on 4 August 1892 from Liverpool to Boston on board the Pavonia. She is listed as being 54 (born 1839) as described as wife.
Pheno
Don't think that is the correct Mary Turner, looking at the other info on the passenger manifest

Travelling on a Boston Passenger List - Mary Turner aged 54 years - wife - was travelling with James Turner - husband -- aged 63 years from Cheshire - occupation :- labourer - going to Rhode Island.
Also travelling Herbert Turner aged 17 years (hatter) and Polly Turner 15 years (spinner)
This is part of that family in 1900 Lincoln, Providence, Rhode Island
James Turner 68 Born Eng. Immigrated 1892.
Mary Turner 63 Born Eng. Immigrated 1892.
Herbert Turner 20 Born Eng. Immigrated 1892.
Sandra