That's how I see it:
Killer-Jessie and Jessie the wife exist next to each other, and it is supposed to be unclear until the very end which of Jessie's two realities is real.
The end actually clears things up:
Killer-Jessie kills her lover Brian because he supposedly blackmailed her client (who then ordered the killing), and finds out that he was innocent only minutes later. It turns out Brian had been married to the client.
In the other reality, it turns out that Jessie's husband is after the money and tries to kill her with a couple of pills. She survives, is put into the mental asylum, but then takes her revenge by assuming the persona of her dream alter ego Killer-Jessie to set things straight.
So it turns out that the reality of Jessie the wife was in fact the only true reality, and that Killer-Jessie's reality was a dream reality.
(If you look closely, this could also be deduced early on from the fact that when Killer-Jessie goes to sleep the first time in front of the TV, she wears a different dress than when she wakes up. Though this could also be due to a time jump of several days, of course.)
However, wife Jessie takes on the persona of her dream alter ego Killer-Jessie, thus making her "come real" and relegating the wife persona into the world of dreams, represented by the world behind her mirrors.
It thus turns out that Jessie's dream persona and real persona are interchangeable, though there is just one reality, that of Jessie the (ex-)wife, and one dream world, that of Jessie the Killer - who becomes real only when Jessie the wife decides to assume her dream persona.
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