Blood was born off Roden Street,
Donegall Road district of
Belfast on 26 May 1938 and lived on Magnetic Street, a cross-community area of Belfast, with her mother and sister. Her father worked in the shipyard, but for the first six years of Blood's life he was away in the army. Her mother worked as a cook at
Mackies foundry. Blood attended Donegall Road Methodist Church Primary School and went on to Linfield Secondary School on
Sandy Row. After leaving school at age fourteen, she began working at a local linen mill. Blood joined the
Transport and General Workers' Union very soon after starting at the mill and would go on to deal with health and safety issues, such as long working hours, as well as wages. She remained at the mill until it closed in 1989 and during this time Blood became the
shop steward and was elected to the regional committee of the Transport and General Workers' Union. == Community work ==