Thank you Frances, MaryM and Rick for your interest and input.
I am now thinking that although my family knew that Catherine 'ran Cronk Ruagh at some time, the photo I have was not taken when she was there; perhaps she did work somewhere else with children.
I am a member of I.O.M. FHS, perhaps I should forward a copy of the photo, together with the few details known about Catherine, and have it appear in the next Journal in the hope someone might remember her and where she worked.