Sounds exactly like what two separate friends of mine did at the start of a manic phase of their manic depression. Both ended up hospitalized for severe psychotic episodes.
That being said I know several bored people who do the exact same thing. Keep in mind that flat Earthers and 911 truthers exist. Even the politics of the both the far right and left have always Incorporated similar ideas.
Still I'd be very concerned. Have someone talk to her ASAP. If she starts applying this same pattern of delusion to her lifestyle and basic hygiene, that's usually a pretty big tip off that someone's in serious trouble. Both people I witnessed go through these episodes, eventually abandoned normal sleep and eating patterns. They replaced health care and hygiene with alternatives. They both ended up at least partially homeless. What's concerning the most is your sister's urgent need to warn others about these theories.
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