M.S.
I personally don't think there is any harm in leaving her in a crib if that is what you both want and she is not climbing out. That just means that when you do move her to a toddler bed, she will be older and will understand better that it is not okay to get out of bed. The down side to moving a toddler too soon is that it takes a lot of fighting with them to teach them to stay put. Try putting a big girl bed in her room with her crib still there, and let her choose which one she wants. If she gets out of her big girl bed, take her back and tell her she must stay in bed or she won't be allowed to sleep in the big girl bed. If she gets out again, then place her in her crib and tell her maybe we can try again tomorrow.