"grew fascinated" is a correct and usable phrase in written English.
It can be used to describe the development or intensification of a feeling or interest over time. Example: As she spent more time studying the stars, she grew fascinated with the mysteries of the universe.
While attempting to modify this classification, I grew fascinated by Strachey's work.
He grew fascinated by advanced technologies and, more important, the kind of society that advances them.
Kochan grew fascinated - some say obsessed - with the implications of the second commandment, the stricture on idolatry.
Discontent with standard Western conceptions of tuning and intonation, Partch grew fascinated with alternative approaches, especially Asian systems.
While making Architecting, performer Kristen Sieh became obsessed with Teddy Roosevelt, while King grew fascinated by Elvis impersonators while researching Mission Drift in Vegas.
Saki was my own initial thought, the Saki of the waggishly precious, or semi-precious, observation ("She grew fascinated by the curtains, which were doing nothing in particular").
I was growing fascinated by the numbers so I asked how many of these books they published each year.
I've been watching "Queen Sugar" since it premièred, last year, and have grown fascinated with its soapy yet increasingly thoughtful and provocative story lines.
In recent years, for example, menswear enthusiasts have grown fascinated by Italian style; men like the late Gianni Agnelli, who was president of Fiat and the richest man in Italy, have become style icons.
More archetypes than characters, they come to life only in flashes of color: one is schooled by nuns, her baptism paid for by the "Pagan-Baby Project"; another grows fascinated with the colonials' skin, which "tore like old cotton".
She grows fascinated with an apparently deserted mansion, where she befriends a mysterious western blonde girl of her own age called Marnie – very rich, but every bit as unhappy as Anna.
