Impossible situation

My girlfriend and I have lived in a rented apartment for just under six months without a problem. Its our first place and its perfect for us. However, just today we were incredibly upset to receive a letter through the door stating other residents in our block have complained about noise coming from our apartment. In the letter it states that the nature of the noise is generally arguing and shouting late at night. Neither of which we do, which is something i say honestly and sincerely. However, across the christmas period we have had my girlfriend cousin to stay several times due to issues she is having at home. My partners cousin is severely disabled in the sense that sometimes her noise levels can be difficult to predict and control- the nature of the issue is sensitive to say the least.

As a result of the letter it has been requested that we attend a meeting in which I intend to explain the situation and rectify the issue as sincerely and effectively as possible. I have handwritten letters of apology to give to our agent apologising to them and our neighbours promising it will not happen again.The letter delivered to us also details us discussing the future of our tenancy at the property which has us obviously upset as we intend to spend at least another 3 years here which may not be possible depending on what is decided upon.

My partner has just now left our apartment after sobbing her eyes out and clearly stating she thinks I don’t care. She is reluctant to attend the meeting because she is ‘scared’. And is now barraging me with texts saying she hopes she dies at work she doesn’t care what happens to her etc- which is not unusual for her. I am also under strict instructions that we cannot tell anyone about the situation. Yet again when presented with an adult situation I feel I am alone in maturely dealing with it and genuinely have no idea how to reply to all of the messages I am receiving from her.

Not only am I surrounded by neighbours who quite possibly detest us. But I am also alone in facing the possibility of punishment from our agent (losing our home) and am now having to deal with the immaturity of my partner yet again in being able to present as an adult in situations. This is quite literally an impossible situation for me to be in and i’m finding it emotionally difficult- what would you do?