It seems like there might be a slight mix-up. To my knowledge, there isn't a widely recognized author named Stephanie Light in mainstream publishing. I've been reading romance and fantasy for years, and that name doesn't ring a bell. It's possible the name is being misremembered or is a pseudonym for another author. Maybe you're thinking of Stephanie Laurens? Her historical romances are incredibly popular. Or perhaps Kristen Light? Alexandra Bracken's middle name is Bracken, not Light. If it's a newer indie author, their catalogue might be small and not well-documented on major sites yet.
My suggestion would be to double-check the author's name on a retailer like Amazon or a database like Goodreads. Sometimes names get autocorrected or confused. If it is a smaller author, their own website or social media would be the most reliable source for a complete, ordered list. Without the correct name, it's tough to provide a definitive list, but I'd start by verifying the spelling.