My friend believes conspiricy theories like the flat earth?

Update: I’ve known her for 2 years and today she said the thinks the earth is flat and that the moon landing was fake and stuff like that. Everyone turned against her on this but it’s really bothering me because nonentity of this is true
How can I change her mind
Update 2: Spelling error. None of this is true*
Update 3: She believes because of stuff she saw online like the flag moving from wind on the mom which was just because the flag was set in motion from there being no gravity
Update 4: Moon*
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