This is interesting.
I tried to look for a time between 7.30 and 8.45 that would seem to best highlight a murder taking place. Notice that the murder occurs with a partile square between the malefics, Mars, natural significator of Murderers is essentially strong, Saturn, natural significator of victims, is essentially weak.
As this is a murder, it would make sense for this harsh and malefic aspect to be prominent in the chart some way, such as configuring it with the angles.
I notice that at 7.22pm, with Cancer 25 rising, this puts Mars in trine with the Ascendant, and Saturn rules the seventh and eighth, bringing death to opponents.
The Moon for this time is right at midheaven, and signifies the event of murder, the Moon being ruler of the ascendant. The Moon is void of course because either it shows the end of the victims life, or perhaps because the murder will go unsolved, the Moon at MC shows the publicity surrounding the event.
I just find that configuring the Mars-Saturn square with the angles must make sense in a murder, and the Moon at midheaven gives prominence.
The trouble is, she boarded a bus home at 7.20, which would give only two minutes to travel home and be killed. I have no idea how long the bus journey is supposed to take, but it must have been short, as otherwise, there would not be a possible estimate for death of at least 7.30 if it was known she boarded at 7.20, so it must be known by authorities that she could have ridden the bus and been home within ten minutes.
So I wonder if the murder took place at 7.22, when she arrived home? She may still have been on the bus at this time, and if this is the case, then what significant event does this chart reflect? I think that if this does not show the time of murder, I think that it reflects a very significant moment pertaining to the event.
7.22pm is about the time she was catching the bus, and probably was as they are usually a couple of minutes early or late, so it's almost as if the chart for this time seals her fate, with the Mars-Saturn square affecting the ascendant, Moon and midheaven. Perhaps her murderer was another passenger on that bus, and as soon as she boarded it, her fate was to be sealed, for she was followed home and killed. I can't help thinking this is the case, when she boarded that bus, her fate was sealed.
I want to have a look at the event chart for the time that she was discovered at 9pm. This may not be the time exactly, but this is the reported time, so the time that is most significant. However, I am very unsure as to which cusps are most appropriately assigned to which persons. The event chart would be about the victim, so I think she should take the first cusp, as she is the subject of the occurance at that time. Then again, perhaps it should be the children who discovered her taking the first, as they are the ones the event is occuring to, and then take her as the tenth. I feel more comfortable withe the latter.
However, in looking at the event for the murder, I wonder if she should be seen as the first or the seventh?I say this because this is a situation in which one person is a killer and another is the killed, on has a superior role and the other is subordinate, and like the way in which the superior or home team is given to the first in a football match, then I can't help thinking that the murderer, the superior party in the event should be given the first, and the victim, the defeated, the seventh, where light is extinguished.
Looking at the 7.22pm chart in this way, then she becomes Saturn in detriment in square with Mars, depicting her violent demise, or at least the fate to which she had then unwittingly succumbed to.
When somebody is murdered as soon as they arrive home, which must be the case here, they have either been pursued into the home, or they have been waited for to arrive back. I think that in this case, the killer was on the bus, and followed her home.