The idiomatic expression "point blank" is used to describe a direct and straightforward action, statement, or decision, without any evasion or hesitation. In the sentence, when she rejected his marriage proposal "point blank," it means she did so directly and explicitly, without any ambiguity or delay. Therefore, "Directly" best captures the intended meaning of the idiom in this context.

The other options don't convey the same sense of directness and straightforwardness that "point blank" does in this context:

"Absurdly" does not fit the context because it implies something that is unreasonable or irrational, which is not the intended meaning.

"Briefly" suggests a short duration or a concise manner but does not convey the directness implied by "point blank."

"Pointedly" means in a specific and focused manner but does not necessarily convey the same sense of directness and bluntness as "point blank" does.