I don't think there's an icon for this

Some kids have imaginary friends.  Today my kid devised an imaginary sister.  This was cute for about two hours, until "they" had to get ready for bed and I had to figure out how to put a nightgown on a 6-year-old who isn't there.  And then we (I) had to carry the nightgown to the bathroom and put it on the potty, prepare a toothbrush (good thing Maggie has four of them), and ultimately make up a bed of blankets on Maggie's floor and tuck the nightgown into it.  

We'll see what the morning brings.