I have found her on the 1891 census as a visitor in Ealing. She is a widow living on her own means.
In 1881 she is living with her 72-year-old husband John Coxon at 1 Mayfield Villas in Hackney. He is noted as a licensed victualler, out of business. She was born in Strand, WC, and he was born in Uttoxeter, Staffs.
In 1871 they were living at 39 Chepstow Place Kensington with a daughter Fanny aged 17 and two nieces Elizabeth Griffin aged 21 and Jane aged 16. John was a licensed victualler.
According to the Ealing Council website she is most likely to be buried in South Ealing Cemetery, also known as Ealing and Old Brentford Cemetery.