<human>: Can you condense the text into three sentences or less?

It's a simple problem - I have this friend (not a very close one) who, whenever I'm in a conversation, would aggressively (imo) inject herself into the conversation and this affects how much I enjoy social interaction in her presence.

Two examples: 1. A friend of mine was talking to me about something. While I was still talking (responding to him), she just started talking very loudly about something else at the same time. The friend ignored her and responded to me, but she wouldn't stop and started talking again when I started talking. This was the first conversation I had with the friend in this interaction, so it's not like we ignored her for a long time. 2. In a company's social event, the head of another department came to talk to me about a recent interview I had because the interviewer was her good friend. Before she got to that she mentioned some issues with the job market and my friend overheard our conversation and cut right into it. The head looked like she wanted to talk to me more about the interview itself but gave up because my friend kept talking. There were a ton of other examples like these but these two are the most jarring ones.

I normally don't have a problem with group conversations at all, but for some reason when it's with her it's impossible for me to talk, and I'm not entirely sure why. It's also interesting that there's no such problems when we are hanging out with other female friends, the problems only arise when the person I'm talking to is either someone authoritative or a guy. She's very traditionally attractive (tall, skinny and blonde), is on a very friendly basis with a lot of other department heads, and is used to be the center of attention. So in both situations I think it didn't sit well with her that she is not the center of attention, as my male friend, and the department head were both kind of ignoring her (at least in the beginning).

Anyways, the situation now is that it's just not very pleasant to be in the same social situation with her and I'm looking for advice on how I can improve my social behavior to deal with this type of situations and make it better for myself.
<bot>: friend who exists in both my personal life and my work life is constantly injecting herself into conversations I'm having. It's tiring me out.