Dinder and Fluffy

So Shelby has had an imaginary friend for about a year now named Dinder. It's a horse that sometimes is a unicorn and she goes everywhere with us. Sometimes she runs alongside our car, sometimes she is sitting in the backseat. I hear stories about her all of the time. This week I was introduced to fluffy who is also a horse that is Dinder's friend. A while back we were in Sam's Club with my mom and all of a sudden Shelby yells "STOP"! "Dinder's babies are right there on the floor you almost ran them over!" I'm just wondering if I should be worried.