Hi, my now 2yr old daughter changed to a toddler bed when she was about 18mths, as she was always trying to climb out of her cot. If Paige isnt trying to climb out of her cot at all, mebe she's quite happy to stay in the cot a while longer? I find it's better not to rush things, and let them advance when they're ready.
I made an adventure of buying Jaidas new bed, and took her along to help pick out the bed and new bedding, and let her help put it together. We didnt leave her cot in there, however did place it in the same spot, used the her same blankies etc etc so she had some sense of comfort, and by the end of all that, she was really excited to try out her new "big girl bed". Luckily, we havent had any trouble with Jaida getting out of bed, but if you do, don't give up right away — continue to encourage Paige to try out the bed. If she's still having trouble after a few days, perhaps bring the cot back. Just try not to present its reappearance as a step backward in development or a bad thing.
Lastly, remember that the switch from a crib to a bed is milestone in your life, too. It's another sign that your baby is growing up and reflect back on when you first set up the crib for your little one.
Hope this helps,
Jaida (6), Ameli (2) & Lacey (2mths) - SA