I stumbled on her stuff back when the whole After series was blowing up on Wattpad. Honestly, I think a lot of people forget she was writing fanfiction first, using One Direction's Harry Styles as a faceclaim for the main guy, Hardin. That was the hook for a massive fandom already on the platform. The chapters were addictive, messy, and updated constantly, which is pure catnip for serial readers. It wasn't polished literature, but the drama and will-they-won't-they energy were off the charts.
Her move to fame felt very organic to the era. The readers on Wattpad made it popular through shares and comments, which caught the attention of traditional publishers. It was a classic internet success story—viral fan work gets a publishing deal and a movie adaptation. The path from posting online chapters to a bestseller list is pretty much the modern fairy tale for writers now.
I've always wondered if she knew it would get that big when she posted the first chapter. Probably not, which is kind of the fun of it.