This particular use of the word is something of heard from other areas of the world for years, but not in my area of the US.  As an example she might say, "We should do something this weekend, yeah?" or "I bet you'd like some carrot cake, yeah?".  We've lived in the same area for years and this is a new thing that she started doing in the past couple of weeks.  My guess is that she's picked it up from some tv shows like the mother on Speechless or maybe the guy from Expedition Unknown.  

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I told her I thought it sounds forced.  She replied with an, "alright then"  and that was the extent of the conversation.  She hasn't said it around me since.  I don't think the way I did it was the problem, but my concern is that she was trying to add something interesting to her personality by picking something like that up and I squashed that.  What could be worse is that she could still talk like that around others, but not me, which I wouldn't want.  I don't want to be controlling, but over use of words like literally, yeah and "I know, right?" really do start to get on my nerves. I suppose I could be over analyzing this, but I figure I'd ask. 