I've read them multiple times and agree with your gf. They're two different things with the same characters. I liked the show less than the books but I still liked the show and I'm sad it's gone.
I think part of the problem is that they deviated way too far from the source material so fan favorites never really got their time on screen. Add to that some things they had to do due to covid and losing a great actor (at least my favorite of the EF5) before season 1 episode 8 and having to scramble to fix that mess and they lost a lot of people who would have been their biggest cheerleaders.
These are not complaints of mine, just some observations outside the racist and sexist bullshit rhetoric that surrounded parts of the show fandom.