Wordpress, give them email and password, and a .pdf with screenshots on where to click to create a new post/page or edit stuff.
It required constant developer oversight, even when only publishing one or two articles a week. Things broke all the time. Builds broke constantly. Things went wrong left right and center.
Don't do it. Give them a Wordpress site.
I don't think the LLMs change the argument either. If anything, dealing with the complexities of wordpress could make it even more difficult without someone who knows what they're doing.
Somewhere around 15 years ago, I thought wordpress was viable, but I think we need to leave it in the dust. I worked with it again 5 years ago, and the situation was no different from what I could tell.
Also instead of making multiple posts, she edits the same post over and over again, adding content to it.
That’s how she was taught to use Wordpress at her old job and no amount of explaining or demonstrating will make her change her ways.
Pros, a ton of docs, easy non-technical customization, long term support, many already experienced users, made for basically exactly what you're doing.
Cons, it's WordPress, and the actual wp-loop is a nightmare of bad choices.