As unsettling as it must have been, what a telling dream! Just before before midnight, the Moon moved to Aquarius. Aquarians like things out in the open, no cloak and dagger, please. Being born under Aquarius means this Moon may have affected you more than you realize. It was an opportunity to get something out, so to speak. Loss unsettles us, no matter how strong we are, and you've obviously just passed the September anniversary of losing your mom. I took some time to dwell on your post. When I awaken from a dream screaming, fighting, and/or crying, it takes a few days to get my head around it. I am also extremely emphathetic to my fellow dreamers who awaken troubled.
Please look to others here for good numbers as that is not my forte necessarily (and I trust their judgment).
A party, complete with dancing, lying down, rocking, etc. I'm coming for you - delivered with antagonism by a parent in a state of undress...exposed....vulnerable. You sought to reach your sister but that action was impeded by a cousin and in the company of an aunt. Your parent literally reached out to you, you reached for your sister, and another family member interfered/intervened.
Sometimes when we dream the message is just in our face and it's like a good old fashioned slap. You know, Duhhhh, I got it now... I don't get that here. I think the convolution in this dream was to get you to step outside of the box.
My sense is that there is a question that you need answered and you probably somewhat fear the answer. That would be the truth, which is reality and a lot of times it simply bites. The level of agitation here tells me you've tried to get the answer but to no avail. I think it's possible you also harbor anger because you feel like those that should be listening, helping, or paying attention to your concern did not or have not. Fear and anger go hand and hand - if you have absolutely no unanswered questions, this would be fear, deeply rooted and maybe not so rational, perhaps borne of a lie or misunderstanding or deception by someone else. Of course, pain and fear go hand-in-hand, and there was certainly pain, physical and emotional, in your dream.
Your mom's role, despite appearances here, is one of help. I sense absolutely nothing to fear from her or her message. No matter what your relationship, positive or negative, when mom speaks we typically listen. In this case, actions and the message were dramatic and relatively negative. However, she was naked, rocking in a chair part of the time, and while she could get across to you, you could not reach your objective. What I took from her presentation overall is that she was really saying, "Seriously???" Yes, I'm here and saying this not so nice thing to you but, hey, LOOK at me! While I'm writing this I'm get a strong vibe on perception. Like maybe something happened that appeared cut and dried, but there was much more to the story. Her words spoken to you were troubling but her appearance and actions did not match the situation at hand. At the end of the day, your mom and this dream have your attention. My hope is that it was a one-time deal, a head-clearing event that you needed, even if you really don't see how right now.
I believe absolutely that our dreams are holders of keys that we need. 