Getting back on track, we all agree that 3rd is the sister, therefore mercury, in the 12th of hospitals.
Mercury separates from a square with Neptune, which indicates deception, but it seems I am the only one who thinks this is indicative of her lying.
The natural house of nurses is the 6th.
I took the sister's 6th (radical 8th) to represent this nurse, and she would be cold restrictive saturn. (Saturn also is the colour black, we now know the nurse is black, but not sure if this is pertinent.)
Saturn has no contact with mercury so there was no attack.
However mercury is in the terms and triplicity of Saturn, so subject to her control.
If we consider instead the radical 6th for the nurse, she would be Jupiter, in cold Capricorn (again, black), retrograde and receiving a conjunction from Saturn. Again, however, no contact with mercury, so no attack. Jupiter is moving closer to controlling Pluto, and this also fits the picture we have of the nurse's character. She is in her own 2nd house, so just working for the money.
Finally, moon is the querent, but moon is also the natural ruler of nurses. And she is separating from mercury approaching north node. North node however is a positive reinforcing position, not a negative one.
So of the possible nurse's significators neither moon nor Saturn nor Jupiter have contact with
deceptive Neptune to indicate a lie.
I would still hold to the idea that the attack either did not happen, or at least not in the way the sister describes it.
Very interesting the observation about Chiron, because the blow was specifically on the head. So where is the head here? It's Chiron in Aries, exactly conjunct the midheaven.
And Chiron is located at the exact midpoint of violent mars/uranus.
So a violent blow to the head, on the midheaven should make it a public display, in full sight of everyone.
However this configuration does not relate to the chart! It makes no aspects. It wasn't realised, or actuated.
If I still maintain the nurse is the sister's 6th (radical 8th), in the sense that she is the nurse assigned to her, this means Chiron the wounded healer (a nurse is a healer!) is on her 3rd cusp of thoughts, communication.
So she was angry. And Saturn her significator is located in her own 12th house, hidden uncontrollable doings. Very unhappy and potentially violent person.
Whether the nurse is Saturn or Jupiter she is opposite the querent/ascendent so tends to oppose her as well.
To conclude, no contact between the sister and the nurse.
No contact of the violent blow.
And it's very good that the moon is moving away from mercury in this situation, and the querent will work towards changing her nursing home! Very unhappy situation for all.