She was 'fanatically' devoted to her job.
a religious 'fanatic' [='extremist']
He is 'fanatical about' boating.
(..) An insult to me is an insult to the Gods. An assault on my person is an assault on our very religion. You were assaulted? I was. By those fanatics who call themselves sparrows. And they humiliated me, they... they beat me, they left me naked and bleeding on the cobblestones. I am lucky to be alive. (..)2015 TvShow: Game of Thrones Title: High Sparrow Season: 5 Episode 3