A.Z.
Hi K.,
Sorry I am just responding, and I know you probably have received enough responses by now but here goes. I would first lower the mattress to see if that works. If she is still able to climb out I would convert the crib to a toddlers bed. I did this with my son after I saw him run across the living room after putting him in his crib one night. ;0) I converted his crib to the toddler bed, and because I was concerned with him falling out I started tying the bumper pads around the bed to cover the opening until I was confortable that he wouldn't fall out. Now he just climbs over the pad at the opening to get in and out of the bed.