Okay, so the author of the 'Twilight' series is Stephenie Meyer. Beyond the main four books—'Twilight', 'New Moon', 'Eclipse', and 'Breaking Dawn'—she's written a few other things. The one most fans know is 'The Host', which is a sci-fi novel about body-snatching aliens. I read it years ago and honestly found it a slog; the world-building felt clunky and the pace was glacial compared to the vamp drama. It's a standalone, though, and some people really love the love triangle (or square?) in it.
She also published 'Life and Death: Twilight Reimagined', which is a gender-swapped version of 'Twilight' released for the 10th anniversary. I flipped through it, and it's... a curious artifact. Doesn't really add anything new, just swaps Bella and Edward's genders. Feels more like a publishing gimmick than a substantial work. There's also 'Midnight Sun', which is 'Twilight' from Edward Cullen's perspective. That one caused a huge stir because an early draft leaked online ages ago, and she finally published the official version in 2020. It's thick, delves deep into his angsty internal monologue, and honestly makes him seem even more of a creepy stalker, which is saying something. That's pretty much it for her major novels.
She's done some short fiction for anthologies, like 'The Short Second Life of Bree Tanner', a novella about a newborn vampire. It's a quick read. As far as I know, she hasn't released a completely new, original series since 'The Host'. There's been talk forever about sequels to that, but nothing materializes. So her bibliography is surprisingly slim for an author of her fame.