Anna’s Archive has basically everything, though it may take a few weeks for new releases to appear there. In that case, a private tracker like iptorrents is going to be where it’s at.

Download Calibre on your computer. Once you have the book add it into Calibre.

Connect the Kobo to the computer. Once it connects, drag and drop the files over from the Calibre interface.

That’s it!

The other option is using Calibre web instead, but that does take a little configuring. I’d consider my method above a good way “to add to her selection without making it more difficult.”

Just tried it out! Happy with the results, but I agree some UI tweaking could go a long way. Where to type your search, and the results are too “clean” to the point where it’s a bit confusing.

Great work!