A.P.
When she starts to climb out of the crib, it is no longer safe. Go for the toddler bed with side rails if you're concerned about safety. It's lower to the ground and the side rails help them to learn to sleep in the middle of the bed. My son was 16 months when he made the switch. We put the toddler bed in the room with the crib at first, then he started taking his naps on the toddler bed (because I knew I'd be awake to hear him through the monitor if he fell or something), then after a week or so, we made the switch completely - he loved it!