Caitlin and Grandmas Weekly Argument

So at the grocery store we have Caitlin and her Grandma come in several times a week. Caitlin is a chubby little girl probably around 10 years old. Caitlin doesn't like to stay with grandma, she likes to wander around on her own and 'sneak' munchkins out of the donut boxes. You're not slick Caitlin I see what you're doing. As far as I know she's cut it out since I caught her.
Anyway they come in occasionally to do they're grocery shopping. It's bad though when us employees already know their routine. It goes something like this.
They come in and Caitlin wanders off to the candy or donuts. The store will be quiet when we hear grandma suddenly yell at the top of her lungs:
Grandma: "Caitlin! Where are ya Caitlin?!"
Caitlin: "I'm over here grandma!"
(Note these 2 are at opposite ends of the store yelling for everyone to hear)
Grandma: "get over here Caitlin!!"
Caitlin: "no grandma I don't wanna!"
Grandma: "I said get over here Caitlin!
Ya know what your doctor said about your donuts"
Caitlin: "I don't care I don't want to go over there"
Grandma: "that's it I've had it! Go to the car Caitlin!"
Caitlin: "no grandma I don't wanna"
Grandma: "I said go to the car Caitlin!!!"
Caitlin: "no grandma!!!"
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This goes on for about 10-15 minutes several times a week. Same thing.
Grandma, go get Caitlin a cell phone so we don't have to listen to this crap. No one wants to listen to you and your granddaughter argue across the store. And Caitlin get over your donut obsession, and treat your grandma with some respect.