Bill Martin's file states she died about 21 in Toronto of TB.  She was at Bible College with Silas and Annie York.  She was known as Bella.

The death index of Ontario, #005711 shows she died in the town of Meaford, the informant was her mother, Mrs. John Lambe.  She died of consumption.
Ontario, Canada Deaths, 1869-1934 about Isabella Lambe
Name: Isabella Lambe Death Date: 2 Jun 1888 Death Location: Grey Gender: Female Estimated Birth Year: abt 1869 Birth Location: On 