Mommy, Chloe's door is open and she's not in her bed!!

Chloe never came out of her bedroom.....until she turned three.  What?  Yeah that's what I was thinking.  She comes out for random things--to use the potty, ice in her cup, rock me, and I just want my mommy.  She never used to do this when she was two!  As a matter of fact, we never, ever had a problem with her sleeping.  From day 1 we put her in bed and she went to sleep.  So I had to break out the safety lock I used to have on Ashlyn's door to keep her in(like a caged animal I know).  Well her door must need some adjusting because she can put her little fingers in the side and pull it open.  Anyways, last night she woke up at 3 am and I put her back in bed.  Then I heard her at six o'clock.  She said mommy twice and then it was silent.  Ashlyn woke up at 8 yelling, "Mommy Chloe's door is open and she's not in her room!"  Ahhhh. .......She was sleeping at the top of the stairs by the balcony.