Cabra road and Collins barracks

I am tracing my partnersfamily tree. His surname is Harvey. His father was a soldier in Collins Barracks and his Mother Annie Conroy is listed on the marriage certificate (15/8/1953) as a spinster living in what I think says Cabra Road Dublin. He never knew his parents. I am able to go back a fair way on his fathers side but it is his mothers history he is particularly interested in and I am getting nowhere. I have the marriage certificate but cannot find a birth certificate for her and consequently a death certificate. Imat a loss. How do I go on? Where do I look?