This is the 18206th most frequent Russian word.
чемпионкой
"Champion" (feminine form).
The word 'чемпионкой' (champion) is used to indicate a title or achievement in a specific sport.
Она стала чемпионкой по плаванию.
She became a swimming champion.
The word 'чемпионкой' (champion) is used here in an instrumental case to describe someone's distinguished title.
Я горжусь своей подругой, она чемпионкой мира.
I am proud of my friend; she is a world champion.
The word 'чемпионкой' (champion) reflects an aspirational state and serves as the goal in this sentence.