Unplug the damn thing!!!
Check your cell. You probably already have an Alexa app on it. Since your lone Alexa works, it was initially set up with an app…so, you already have one lurking in your universe & you just don’t know it!!! This tells you how to set up the news; so, I’m assuming that turning off the news would just be the reverse.
IF you can’t find your Alexa app, I suggest you add one to your phone for at least long enough to turn off the news & then you can uninstall it. Another suggestion. Give Alexa an instruction to “Cancel News Alarm”. The worst that should happen is that she’ll continue to ignore you. At best, she’ll turn off the alarm for the news.The one thing that I’ve learned with Alexa is that you ARE going to do it her way or you’re NOT going to do it at all!!! Good luck!!!
EDIT: You might try when she starts reading off the news to give the command “Alexa Stop”. Since it’s set up as an alarm, you’ll be telling the alarm to stop. It might only stop that segment of the news but you won’t have to listen to it. It’s NOT a permanent fix, but temporary is better than nothing until you can figure it out.