Can we take a second to appreciate how prolific she is? To have a list long enough to cause confusion is a testament to her output. We're lucky to have so many books to sort through!
Most of the suggestions here are great. My personal vote is for the Fantastic Fiction website. It's clean, ad-free-ish, and just gives you the facts: title, year, series note, and cover art. It's my bibliographic bible for any author.
Plot-wise, you won't be lost reading out of order. But theme-wise, you might miss a subtle progression. Her early books often focus on a woman in immediate, personal danger from a specific threat. Her later work expands to look at systemic family secrets, the dangers of technology, and the fragility of community. Seeing that expansion happen in real-time, book by book, is a study in how a writer's interests evolve with the culture.
You could almost group them by protagonist type. The Ridley Jones books are about a woman caught in a conspiracy. The Hollows books with Jones Cooper are detective-led. The other Hollows books ('In the Blood,' 'Crazy Love You') are intense psychological portraits. So pick your preferred protagonist style, then read those in order. For Jones Cooper, do 'Fragile' then 'Darkness, My Old Friend.' For psychological deep dives, 'In the Blood' and 'Crazy Love You' can be in either order.
I read them based on audiobook narrator availability. Some are narrated by different people, and a great narrator enhances the thriller experience. Julia Whelan narrates a few, and she's brilliant. So my order was: whichever audiobook was available at the library with a narrator I liked. It made the experience more about performance than chronology. Highly recommend this if you're an audio fan—check the narrators on Audible and pick based on that.