FWIW I talk too much and am an over lapper, and adhd has been queried by those around me 😂
The way my thinking works is very visually and in lots of branches - then branches connect, associate, and I jump from topic to topic, but also back again.
The over lapping conversation style can be like this; for me it’s like a game of ping pong.
But everyone has different thinking styles. Where you have autism, adhd or not.
Others are linear (eg golf) and diversions would be interruptions.
Dyslexia has fallen out of common knowledge but the dyslexic way of thinking can be extremely associative, 3D esque. Which is why they of have to be taught to read in a very particular way but can be extremely intelligent and creative.
Very creative people (not just artists, it is a skill in science, business and maths too) can also have these thinking traits.
How you approach this with her needs care and the conversation style post is really helpful as everyone is now assuming, thanks to social media, that people who do this are autistic or adhd.
The reality is that everyone is different, has different thinking styles (eg aphantasia v hyperphantasia), some may also have a condition that makes things even more challenging (eg autism), some may have it and not be diagnosed because it doesn’t particularly affect them, and a few may just have a self absorbed personality.
( ND is not a diagnosis, it’s a social justice term to describe disabilities which are neurological. The problem is here that these conditions are subjective.)