This is the 1134th most frequent Russian word.
великой
"Great" or "grand."
Here, 'великой' is used as an adjective in its instrumental case to describe 'литературу' (literature), indicating something significant or noteworthy.
Она верит в великой русской литературу.
She believes in the great Russian literature.
In this sentence, 'великой' describes 'королевы' (queen) and is used here in the genitive case to signify admiration or historical greatness.
На площади стояла статуя великой королевы.
On the square stood a statue of the great queen.
Here 'великой' serves as an adjective in the dative case to describe 'истории' (history), highlighting its importance and grandeur.