I really struggled with readarr but maybe because I never used a private tracker as others have mentioned. I'll give that a try
I had a lot more luck with https://github.com/evan-buss/openbooks but it's completely manual. I make a note of books I come across and then every few weeks manually search on here and add the downloads to a calibre monitored folder.
That's really sad, feel especially bad for the kids who were with her who are going to feel this for the rest of their lives