Well, the bed rail I got was meant for regular beds and not transformed cribs. So it looms a little high (the rail obviously expecting a taller regular mattress) and then starts tilting in towards the inside of the crib.
MLO didn't really like laying in her crib and feeling like the railing was going to fall on her. So we spent a bunch of time trying to fix it. We ended up with one of her very large stuffed animals (the kind that is as tall as me) being wedged in one corner of the bed and sort of holding the rail up.
MLO still wasn't that happy with it and we had a rough night.
Hopefully she will get used to it and be okay tonight.