Coworker keeps butting into conversations with my coworker next to me?

I work with a team of 8 other secretaries. I sit next to one and we talk about food and nutrition at times. We discussed diets, etc and she told me what foods she was planning on cutting out. The other co-worker must been been eavesdropping as she said to the co-worker next to me, "You sound annoyed". ... show more I work with a team of 8 other secretaries. I sit next to one and we talk about food and nutrition at times. We discussed diets, etc and she told me what foods she was planning on cutting out. The other co-worker must been been eavesdropping as she said to the co-worker next to me, "You sound annoyed". The conversation wasn't even with her, but between me and the co-worker next to me. It's not the first time she's chipped in on conversations. Why are people like this?
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