Can this be said on its own if the one I'm saying it to already know what she's been diagnosed with?
"She got diagnosed three months ago."
Yes. As you may already know, this use of "got" to form the passive is informal. In cases where you need to avoid informal language, use "was diagnosed" instead.
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Yes.
As you may already know, this use of "got" to form the passive is informal. In cases where you need to avoid informal language, use "was diagnosed" instead.