My eldest son was out of his cot and in a big bed by the age of one due to the fact that he had started to climb out. My 3 year old son only went into his bed from his cot a year ago. I knew he wasnt ready and was still very happy where he was, so i didnt see the point in changing until he was ready. They are all different and there is no wrong or right age to do it.
I think i know where gina siis coming from with the mother daughter thing though, Mums always give advice and sometimes daughters dont accept that. pippa is quite right, it is entirelly the daughters decision but as her Mum, gina is just having her say, quite normal, maybe just worded wrong on this question.