K.S.
I do think 1 is too young too. I kept my son in a crib until he was 2 1/2 since he never figured out how to climb out on his own. The only reason I switched him at the time to a twin bed is because he was potty trained otherwise he was still content in his crib. If she isn't climbing out of it I would wait until 6-12 months and then when we switched him at the beginning there was still nights he would want to sleep in his crib so we kind of let him decide when he wanted to. If she wants to sleep in a toddler bed and does well with it though that's all that matters as long as everyone is comfortable with it and sleeping well.