sit her down tell her they are fake...let her help you build them so she knows they are not real .....and say i need to put these things out to keep the real goblins at bay .....example:heck my dad used to say ...on long trips if your real quiet youll seee big foot man i thought he was telling the truth years later i know he just wanted us quiet ...for hours me and bro would be whispering i think i saw him lol