Beans, I'd suggest watching your DD to see how much she wriggles and moves around. I had done that a lot with DD leading up to her going into the bed (due to sleep issues) and found she really favoured sleeping hard up against the side that is not against the wall so for us a rail of some sort was really necessary. I figure she's going through enough change moving into a bed that I didn't want her waking because she'd fallen out, especially as we could avoid it with a rail.
Just my opinion and I realise some kids don't fall out but each child is different.
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