Not sure what to call this...

I just got home from the most emotionally, physically, spiritually draining experience of my life (I hope). Tomorrow is Haylie's birthday and so being "the good parents that we are" we put her to bed early so she could get a good night's sleep. Being as it was still light out, Joe and I decided to go outside and do some yard work. We were probably out there for about 15-20 minutes... Right when we walked in the door, we heard our doorbell ringing... our neighbor and another lady were standing there and they say, "Do you have a little girl with a green shirt that's carrying a cup?" My heart immediately jumped into my throat. I ran outside, looked around the corner of the house to see if the garage was opened (which it was) and sprinted back inside for the keys. The road that leads to our avenue is probably 3/4 mile long. Haylie was over half way down it, barefoot, after the sun was set. A man was holding her. I don't know what else to say. I grabbed her, burst into tears, and yelled at her. What do you say to someone who has found your child wandering down a road all alone? The endless list of what ifs just keep filling my mind and I'm afraid it won't be over until I cry myself to sleep. Actually, it'll probably never be over. I'm sure I'll remember this night forever. I told her, "Haylie someone will take you away and never bring you back and you'll never see Mom or Dad or Connor again," thinking it might sink in a bit.... Her response, "I wanted to see the boy." What do you say? What do I tell her to make her understand? Why did I assume that telling her a couple of times not to touch the garage door button would mean nothing? Any comforting thoughts/words would be greatly appreciated.