S.J (asker) Jun 2, 2022:

Thank you all.

Tony M May 31, 2022:

@ Jennifer Absolutely not! I think a perhaps commoner expression in EN might be "...she's forgotten to be blonde"
I'm quite sure the implication is that, contrary to the stereotypical expectations, this particular blonde deos not live up (down?) to that reputation — doesn't buy into it, perhaps.

Jennifer Levey May 31, 2022:

@Tony Errr... If, as you suggest, she doesn't seel (sic) to know that she's supposed to behave in a 'blonde' way ... doesn't that tend to support the idea that she is in fact pretty dumb - IOW she is a stereotypical blond?

S.J (asker) May 31, 2022:

Yes. It makes sense.

Tony M May 31, 2022:

@ Asker I believe it means that she is literally 'blonde' (i.e. blonde hair), only she isn't stupid (i.e. doesn't behave like the stereotypical 'blonde' is supposed to) — in other words, sort of, she doesn't seem to know that she's supposed to behave in a 'blonde' way!