looking for my half-sister, mothers name Barbara Stevens.

I'm looking for my half-sister. Her birth name was Mona or Ramona. She was born at the Salvation Army Grace Hospital in Ottawa in 1961 (we believe). My mother was 15 at the time and her name was Barbara May Stevens. Her D.O.B. is Sept. 16, 1946. Mona's adoption was handled by the Children's Aid Society in North Bay Ontario. Any information about Mona or how to go about how to possibly find her, would be GREATLY appreciated.