Ah thanks everyone. You're right Tyrs4u she absolutely hated every second of that picture but was spoilt afterwards!! Am thrilled with the news! Will have re think her name now but might just leave it because I think she knows it ;-)
Used to go to school with a "Herbella" and a "Herberta", at various points of my childhood, if that's any help...not sure what they, themselves, thought of their names, though. Other possibilities might be Herbeisha, Herbetine, Herbolyn, Herbulia, Herbina, and Herbette.
Or simply Bertha or Bertie (which is what Herberta mostly went by).