She is happy to spend time with someone she has not seen for a long time and to be at your house, she wants to go out and explore, she tells you that she is bored of being in an internal place, she could not even go out trick or treating, you don't feel capable of being with a girl in the street and you say no, that she plays at home or watches TV.
You go to the bathroom and go back to your room and see her playing with your things and the lamp, you tell her not to touch your things, she says she is bored, and she wishes it was Halloween again and she could go out with you, so the lamp shines.
You see the shine and you are in the street, full of Halloween decorations and people in disguise, especially children, she sees this happy, and she wants to go trick or treating, you tell her that you don't want to, also you are not disguised, she looks like herself angry and then pensive grabs the lamp and wishes that both have the most realistic costumes possible, and you see that glow again.