in return for surviving, the wilderness still takes something from jackie. her life isn't free; nothing in the wilderness can ever be given for free. as time passes, she begins to lose her grip on sanity.
she starts seeing things after she first finds javi. mostly shadowy figures, which she puts off on fear and darkness whenever possible. occasionally she hears voices but she'll tell herself its just the wind.
but after a month in the tree hollow, she starts to believe the white elk is truly around. she just knows her and javi are not the people to catch and kill it. this is part of why she keeps checking on the cabin group; she wants to know if they've killed it yet, if they have that food they desperately need.
after the second month in the tree hollow, she knows the voices she's hearing aren't the wind, but she's in denial... this is close to when van and tai find javi and she returns to the cabin because she doesn't want to be alone now that they've taken him back. her fear of what the voices and shadows might do is too strong to face alone.
things escalate from there. she's no lottie; there isn't a bond, the communication isn't two sided, she can't make deals with the wilderness. it just wants her scared. and she is scared. the hungrier she gets, the scarier it gets, but again; she tries to deny its real. she tries to act normal and fine for shauna when shauna goes into labor, and then that all unfolds the way it does and the pair of them aren't capable of caring for themselves, much less each other.
by the time they're preparing to hunt one of their own, jackie's much quieter. she admits the things she sees because they're so vivid, she thinks the others can see them. shauna's the first she admits it to, of course. an elk in the window; can't you see it? no one can. no one wants to tell her that. they placate, they contemplate hunting her, they discard it when they realize the wilderness has chosen her in it's own way. in her lucid moments, she thinks they're insane. in her darkest moments, she can be convinced of almost anything. this is how they get her to eat; we found the elk. we're spared another week. she believes.
she still helps; she'll empty buckets, she'll read aloud if anyone wants to sit and listen. sometimes the stories take a turn from the real narrative into the creepy, but usually she gets back on track eventually.
it goes on like this until the cold breaks, giving her a much needed reprieve; the wilderness can be kind, too.