My bf and I got home from dinner tonight, expecting to see Ella looking at us excitedly from her x-pen. But instead of being in her locked pen, Ella greeted me at the door

I know that her older sister is quite the climber, but we didn't think we'd have to worry about that for a while--Ella is only 6 months old (today!). Thankfully, she didn't leave us any messes (that we've found).
So, I guess I'll be looking for a taller x-pen. Or at least one that isn't so easy to climb.