My daughter (4) is an only child and enjoys imaginative play. She pretends to be all sorts of characters, inspired my TV shows or entirely made up. On consistent part of the imaginary play is an imaginary older sister, Lilly. Sometimes when she gets an idea we question her about (e.g. girls have rainbow brains and boys have brown brains) she will tell us Lilly told her. Today, on the way back from a trip to visit family, she told us her and Lilly were doing a dance performance at 4PM, and we have to drive her there. She gave us an address (a nonsense one, but still one she insisted on) and tried to tell the satnav to show us the way. We played along a little, asking what songs there were and about the schedule etc.. So far, pretty standard fare for her imaginative play. The only exception - so far - is that she had given the same details to my wife that morning, so it's more persistent than normal. But, when we arrived home and she noticed it was home (and not a dance studio) she had a melt down. The biggest meltdown I've seen her have with the exception of when she is hurt. She told us surprisingly coherent directions (but they would have taken us to a Lidl - so following them would have just delayed this meltdown, not avoided or calmed it). And she cried and cried. And she insisted it's real, not pretend.

So, is this normal? Do I need to worry about her and her grasp on reality? She was pretty sad a few days ago while insisting Pokémon are real, but it's only in this past week that my wife and I have noticed this sort of behaviour.

Also, is it a problem to play along? While I thought these were clear-cut playing I entertained them as much as my brain could. But, is that part of the problem?