Cheyanne- for real or imaginary?

This is my niece Cheyanne... not to be confused with Skylar's imaginary friend named Cheyanne. As in, "Skylar do you love Mama?" "Nope, my wove Cheyanne." Or, "Skylar did you have fun at Nana's today?" "Uh-huh, and Cheyanne too." ... Or, "Skylar did you paint that picture!?" "Uh-huh, and Cheyanne too." ... Or, "Skylar, do you want to go to the store with Mama?" "Uh-huh, and Cheyanne come too?" This last one is interesting, b/c in these type of scenarios, Skylar will actually look to her side as if Cheyanne was really there.

Really, honestly... this is how Skylar answers about 98% of questions asked of her. Oh, and she also continues to call her "Shine" most of the time. I'm not sure if I should start to worry, or just accept that Skylar loves Cheyanne more than anyone in the world.