It's a noun phrase, meaning that she is a very thin woman. Example of sentences are eg She is a reed of a woman. eg A reed of a woman walked down the street.
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It's a noun phrase, meaning that she is a very thin woman.
Example of sentences are
eg She is a reed of a woman.
eg A reed of a woman walked down the street.
Clive
"A" is an article that precedes a noun. "Reed" is the noun. "Of a woman" is a prepositional phrase. "Of" is not connected to "reed."
I suppose you are thinking in terms of description, but you should consider the grammar first.
Additionally, "A reed of a woman" is not a sentence. You might have found it in a novel or a story, but it is not a complete sentence. The idea is something
A reed of a woman who does not keep track of her age.
It is a noun phrase, since it does not have a subject-predicate structure (the relative clause has such a structure, but it is a subordinate one modifying "woman", not a main clause).
The head of the noun phrase is the noun "reed", which is modified by the preposition phrase "of a woman", which has "of" as its head.