ManWithAPlan and Benji have my thoughts covered here. A possibility is schizophrenia. Onset can occur in late teens or early twenties and vivid/bizarre halucinations are a possible and widely known symptom. Also watch for periodic 'flattening', which is an absence of emotion and/or speech, or even social activities (compared to her prior state).
If she's doing drugs or if she's going for long periods without sleep that can cause similar hallucinations. When my insomnia was at it's worst I'd go for 48 hours at a time without any sleep and by the end of that I'd get quite paranoid. My most common one were these little black demon-type creatures that would sit around me, but never directly in view. I remember they had very sharp teeth and rat-like tails and they'd always sit off in my peripheral vision. I'd often see them scurrying around, always bolting for places (I once watched one jump right into the sink; of course, when I walked over to check nothing was there). The point of telling you all this is to illustrate just how vivid and 'real' hallucinations brought on by sleep deprivation can be, in which case, not sleeping is definitely not the answer here. You need to get her to get some rest, which if it's feasible may even involve crashing at her place for a few nights to reassure her. If she's doing any drugs she needs to stop asap and consult a doctor.
Good luck and all that, keep us posted.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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