The article mentions that two of her books (The House of Arden and The Railway Children) are being republished this fall. That said, her copyrights have expired, so they’re also available now as open‐source, public domain ebooks at Standard Ebooks: https://standardebooks.org/ebooks/e-nesbit
I was a big fan of Nesbit’s Psammead trilogy as a child: Five Children and It, The Phoenix and the Carpet, and The Story of the Amulet.