OP, have you considered indulging your sister on a limited basis? I'm suggesting things that are negligible and still relatively normal.
For instance, telling her you think the conspiracy part is bunk, but you're OK stock piling two weeks worth of supplies just in case. Or for the stock market stuff, just tell her you think it's silly, but you'll indulge her by just telling her of a stock or two you liquidated that you were planning to get rid of anyways?
I'm thinking that doing so at least doesn't completely alienate or isolate her from everyone else. Plus having two weeks supply on hand isn't crazy like two years and it's not a bad thing to have in the event of a winter storm or as an easy access for supplies if you like camping. Hopefully in the long run, she might see it as silly because your indulgence to her "opinions" are costing you real money.
ie:
"Sister, the world didn't end. Two weeks supply cost me XX which paid tax money to the government and dented my credit card bill... But oh well, better safe than sorry."
Theoretically, I'm thinking that by doing so sorta helps to ease her towards the idea that some of her requests are overreactions and keeps her from going too deep or entrenching herself deep in her opinions. Idea wise, it's kinda like acknowledging the potential risks of any other activity (ie: driving), but acknowledging a risk that is a long shot (ie: Keeping a safety kit in the trunk + USB jump starter for boosting batteries or charging a dead phone in an emergency) as opposed to constantly shrugging off concerns that someone has.
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