Is this a new thing?
Maybe she just doesn't realize it or have the self awareness to know how she comes across.
If you like her and value her friendship you just have to let her know.
I have a friend that changed and similarly talks non-stop and repeats the same stories. I cut him right off and bluntly point it out to him, he also goes off on wild tangents that have no relation to anything, when I point it out, he said "yeah that's what my wife said" 😂....sooo I reduced my time with him including texts...I think he's getting the gist...