Isabella was the daughter of unknown parents. The date and place of her birth have not been found.
She had two marriages/partners. Her first husband was Robert Thomson, who she married in 1900. The place has not been found. Their only known child was Robert McCreat (1901-1976).
Her second husband was William McCreath, who she married on 26 OCT 1906 in Gorbals, Glasgow. Their three known children were Jame (1911-1989), Alexander Campbel (1912-1976) and Willia (1916-1975).