I say.. unless you have another baby on the way and need to move her early, just do it when she is ready. Dont listen to when everyone else did it as every child is different and are ready for things at different ages. Im moving DS over this week to his big bed.. he will be 19 months, but thats only because i have another baby on the way and want him to get use to being in a big bed for a few months prior. If i wasnt expecting, then i would honestly be holding off for another few months.

Best of luck.