She's my girlfriend.
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She never lied to me and I'm not naive for not thinking that she's playing me because she isn't and I know this as a fact and with proof. She has spoken English her whole life. What she sees isn't changing. It stays at her seeing yellow as green and green as yellow. But I think, according to her, she sees very light shades of yellow and green properly, as I showed above (yellow shades). And just because you don't know of something like this existing doesn't mean it can't. Things exist people don't even know about yet, or many anyway. I just want to know how to fix what she sees and what it is that is causing this.
And if she was seeing properly but was miseducated in the names of colors, why would she say Frisk's skin tone looks nothing like a (white) human skin tone, but instead, green? I tested her many times with color blind tests and testing what she sees myself by showing her different shades and colors and asking what she sees (she doesn't see much difference in a few shades of blue, too).