Thanks for the replies and sorry I haven't been back sooner.
She's very spirited and I can totally see her climbing out and wrecking havoc in her room. But, I suppose you take that chance at some point, right?
Bex- my DD too is a climber, and I'm surprised she hasn't tried to escape yet either. I don't have bumpers in there - she's too old (I think) and I was afraid she'd use them to make her way out.
I guess we'll wait.