EmpressArwen
This really made me think of "Peter the Pumpkin Eater" and "Jack Lantern". But it does not seem scary at all.
Could even be like a "mask" I reckon.
So, how does this connect to Rachel Mellon.
All I can think of is that maybe she was into the "holidays" and maybe Halloween might have had some impact on her whether positive or not so positive.
Also, with Halloween being in the month of October, the month itself may have meant something to her whether a birthday, special occasion, an event, anniversary etc.
Now it is "mask" like too, so I would say some things were hidden about her life. For example, maybe on the outside she smiled, but on the inside something else was going on.
That kind of thing.
She may have been finding herself as well as 13 can be a really awkward age for some.
I closed my eyes and focused on the mask...I'm getting a feeling that this is important in two ways...one a literal mask but a stronger feeling of metaphorical mask...like someone close to her wasn't what they seemed to be....very dark feeling...there is a sexual element here...someone she trusted didn't end up being who she thought he was.