However, her quest to pursue her passion in acting would have to wait as her parents forbade her to attend R.A.D.A. Instead, Sheena returned to Belfast where she attended Physical Education College; a much more stable and proper education than one in acting, in her parents' view.

Sheena dropped out of Physical Education College after one year in order to go on the road with the last play produced by a relatively famous theater company named "The Ulster Theater Company". Sheena had been acting at an amateur level throughout much of her schooling years and she had taken some private drama and elocution classes, but the Ulster Theater Company play was her first professional acting job.

Sheena soon went on to become an announcer for the local (Ulster) television station. As her contract with the television station was coming to an end, Sheena's sister (who had immigrated to Canada) announced that she would be getting married and she wanted Sheena to be her bride's maid. Sheena accepted the invitation and decided that she would stay in Canada for six months after the wedding. Thirty-five years later, Sheena is still in Canada.

Sheena's first job in Canada was as an English teacher in the predominantly French City of St-Hyacinthe, Quebec. Sheena did her best to learn the French language as fast as possible. Sheena worked at La Poudriere Theater Company and then at The Piggery in North Hatley, Quebec before being noticed and lured by Jean Gascon to go to Stratford where she spent two seasons acting. Sheena continued to work in theater across the country from Halifax to Edmonton to Ottawa to Knowlton and finally to Montreal. During these years spent travelling across the country, Sheena also developed more and more experience acting in film and television. Sheena has now appeared as a principle or lead character in over 40 feature film and television projects including: "The Sum of All Fears", starring Ben Affleck and Morgan Freeman (Paramount Pictures), "Abandon" (Paramount Pictures), "Varian's War", starring William Hurt and Julia Ormond (Showtime Entertainment), "Affliction", starring Nick Nolte and James Coburn (Tormenta Productions), and "The Boys of St. Vincent" (National Film Board of Canada). Sheena has grown to really appreciate and respect the mediums of film and television over the years and she says that she would most probably be considered a character actress by industry standards.

Life these days has slowed down considerably for Sheena since the death of her husband recently. Sheena is now quite content to stay at home (St-Mathias. Approximately 40 minutes outside of downtown Montreal) and tend to her garden, her old country home and her dog and cat. However, Sheena admits, "It only takes the faintest scent of an interesting project to lure me away from the country and towards another wonderful acting experience".