Too Close For Comfort

We had a scary incident today. Scary as in 'hug your kids and never let them go because you realize you could have lost them' scary.
Dixie and Summer love to get gum from mine and Jim's cars, and today I had given Summer a piece while the two of us were unloading some groceries from the car. When we came in, Dixie saw her gum and commented about it, but basically let it go at that. Later, Jim was out working in the garage and the girls were out there as well. I came in and was working and then after a while remembered I needed to make the girls some lunch. So I went and grilled up a grilled cheese sandwich and then called the girls in to eat. Dixie was there, but I couldn't find Summer. I checked out with Jim, where I'd last seen her, and she wasn't there. She wasn't in the back yard.
"Dixie? Do you know where Summer is?" "Um, no."
I can't find her in the house. I check everywhere. A little bit of panic is setting in as I realize she can't be in the house or back yard. I realize the front door  is unlocked and immediately go out to check the street. I glance at the car (since she likes to play in the car), but the doors are all closed (and she doesn't know how to open or close the doors) and I don't see her head bobbing around in there, so I go to the street and look up and down the street. No Summer. Then I hear a faint whining. It's coming from the car. It's over 90 degrees out here and even hotter in the car. I run and open the back door, and there is Summer curled up in a little ball, beet red face (almost a purple) with sweat just dripping off of her, and she's crying. A lot.
I immediately grabbed her and rushed her in the house (calling for Jim to come in and help as well). I stripped off all her clothes and Jim got her cold water to drink and we got a cool cloth to rub on her body. I have no idea how long she had been stuck in the car, but I'm guessing it had to be at least 15 minutes.
I was crushed. I cried. I sobbed like a little baby realizing that if I hadn't found her when I did, considering how hot it is, she could have easily died in that car.
She is doing just fine now. After 15 minutes she was still red, but up and going again. Thank heavens for miracles and guardian angels and the protection and guidance of the Holy Ghost.
***
We later pieced the story together to realize that Dixie and Summer had gone out to the car to get Dixie a piece of gum (I'm kicking myself that I left the front door unlocked!!) and Summer had apparently wanted to stay in the car and play, and Dixie 'didn't want the mosquitos to get her', so she closed the door on her. Then Dixie just came back in the house and Summer was left out there- not able to open the car door to let herself out and Jim and I completely unaware that they had even gone out there.
I can still see her face as I opened that car door and she just looked up at me from down on the floor with sweat and tears running down her shaking body. It absolutely breaks my heart!
Go hug your kids. Make sure they know how much you love them. And then go lock your door.
Loves.

P.S. I told this to a lady as I was getting my hair done and she told me to teach the girls how to honk the horn. That way if they're ever stuck in the car, they can honk the horn to call attention to themselves. Just wanted to pass that along as some good advice. I'll definitely be teaching my girls!