An Entitled Mom steals my iPad and demands I let her kid keep it.

I work at a car dealership as a receptionist, one of my duties being greeting customers when they enter. I am a professional artist on the side and I've been busy with some commissions lately since it's not busy at the dealer, I started working on my iPad mini. It's old and I'm working on upgrading but I currently can't afford to, so I live with it despite the battery life being really short and I have to basically keep it plugged in at all times. 

During my lunch I was in the waiting area doing more work when a kid, a little girl no older than 4, came up and watched me work. This happens a lot when I draw in public and usually the kids just ask a lot of questions, but this nice girl was very quiet and just had a look of amazement, so I just let her be.