I kept my boys in their crib as long as possible. My sons are 15 months apart--- I got a second crib for my second son. I like the safety measure of a crib so if she isn't ready to transfer, don't do it yet. You can get a second hand crib pretty cheap. good luck hon
When my little girl could stand up and climb out I took the crib bars down!
My son went into a big bed at 17 months. He has a cabin bunk so the bottom is very low to the floor. I put a stack of pool noodles under the sheet to stop him falling out.