Is OTHER wrong in the post ? POST : I'll explain!

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My mom may have a bit of ADD. She can't really stick to a topic for too long, unless it's one she personally finds relevant. Personally I think it's a bit of lack of refinement/etiquette on her part. It's like she has a one track mind, or a hidden agenda.

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Often, when we are together with a bunch of people and having a conversation which bores her (one to which I'm clearly listening &amp; contributing though), my mother will turn to me and completely change the subject.

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The issue is, I'm paying attention to what someone a bit further away is saying! The table at the restaurant is talking about my family's new car? Well, she will ask me how my job is going. I despise this because it's a gateway for too many side conversations. I'm not saying there's no time and place for side conversations in large groups, it's just I feel she attempts to begin new conversation during moments that are uninteresting to her \*yet not necessarily moments which are uninteresting to me.\*

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So I have been experimenting with tuning her out and sort of hinting with body language that I am engaged in another conversation right now. And unavailable. But in doing so I kind of feel like a jerk. We do live hours away right now and I know she misses me. But she has always done this, and I am not sure how else I should address it. Perhaps she will get the point if she is ignored every inopportune time she keeps trying to change the subject ? AITA?