This is the 1751st most frequent Russian word.
дочерью
The word **"дочерью"** means **"by (the) daughter"** or **"as (a) daughter"** in the instrumental case of "дочь" (daughter) in Russian.
The word 'дочерью' is used in the instrumental case to express the state of pride related to 'daughter'.
Я горжусь своей дочерью.
I am proud of my daughter.
Here, 'дочерью' is in the instrumental case, used after the verb 'стала' to denote a transformation.
Она стала дочерью своей мачехи.
She became the stepdaughter of her stepmother.
In this sentence, 'дочерью' is also instrumental, showing the cause or focus of admiration.