She´s SO /THAT beautiful she blows my mind.: Is both (= So or THAT) possible or is it rather that you use "SO" as an exclamation and THAT if you provide context to go with, e.g. a comparison?
Top answer
I'm so tired. = I'm very tired. I'm that tired.
— GPY
I'm so tired.
= I'm very tired.
I'm that tired.
= I'm as tired as something previously mentioned, or so tired as to cause or bring about something previously mentioned.
She's so/that beautiful.
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I'm so tired. = I'm very tired. I'm that tired. = I'm as tired as something previously mentioned, or so tired as to cause or bring about something previously mentioned.
She's so/that beautiful. -- works analogously.
She's so/that beautiful she blows my mind. -- these mean the same, but "that" is less standard than "so".