Our 3-year-old daughter has been talking over any conversation in her vicinity for the past few months with increasing intensity. I can't talk for more than a minute or two to my wife when our daughter is around, neither of us can talk to anyone else, house guests can't talk among themselves without our daughter trying to join the conversation if allowed or talk loudly over it if not.
My wife and I have already tried simple explanations, promising to talk to her as soon as the other important conversation is over, talking to her about importance of other people talking without her interfering, and none seems to have worked. Lately I can't seem to keep it anymore and tend to raise my voice suddenly at her telling her off for her repeated interference.
Now I warned our daughter that she will need to go to her room if she breaks other people's conversation again until she's ready to come back and not do it again. This we've been using recently when our daughter throws a fit and it seems to work to a degree (we have yet to finely tune ourselves to tell whether it is just attention-seeking fit, in which case this seems to work, and when there is a real problem we've missed, which is a rare occurrence, luckily). The going to her room is in reality no timeout, as she now usually needs less than ten seconds to enter her room, drink a bit of water and come out calm and willing not to act out. Even at the beginning we weren't leaving her alone for long peroids of time, we made the going the important moment.
She is our first and only child and so far seems more energized than other children we know (and more than we both are told we were in her age), and generally we tend to have problems with guiding her to spend all her energy on bad days when she can't just run around and play outside for at least half a day.
Sure, this, too, will pass. We would, however, be grateful for other options, which may ease the situation in the meantime and help her build a sense of respect for others (and at the same time help us respect her and her legitimate needs).