OK, I see that I can't post attachments. But here is my previous post on Casey's chart.
Casey has her natal Sun and Mercury in a square to her Mars and Uranus.
This, in her natal,chart, indicates what we already know from her behavior...
(agitated, incoherent, and erratic thinking, excitable, argumentative, quarrelsome, self willed obstinacy, accident-prone, potential for violence, haste and premature action, liability or proneness to accidents or injuries)
Given that her Sun and Mercury are in Pisces, she should have a very subjective and personal outlook on life, and would be very impressionable, moody, and prevarication is also probable under stress.
Mars and Uranus in Saggitarius account for her impulsive behavior, sudden outbursts of anger, acting in haste, her need for excitement and intolerance of routine.
Now, with Uranus presently sitting on her Mercury, and squaring her natal Uranus and Mars, and the transit of Pluto squaring her Sun, I see the potential for violence, sudden impulsive actions, and then lying about it. The Moon travels so quickly around the signs that it is generally a triggering device, so I wonder what happened on the dates mentioned above.
It is very possible that anything that might have happened to Caylee was a sudden and disastrous accident, caused by sudden impulsive actions on Casey's part. But, given the planets in Pisces, her natural tendency to lie when caught is eventually going to catch up with her.
Pluto will be her downfall, for it's present position can cause her to over-estimate her power to escape the consequences of her actions, and she can be arrogant about it all.
I feel she is in danger of a mental meltdown at some point, particularly when her house of cards comes tumbling down.
Now, all that said, there are other possible times for whatever happened to Caylee to have happened during this period, as Uranus and Pluto are the cause of the tension, and the Moon would be the trigger.
That is why we need to tie down whether the ex-BF is absolutely sure he heard Caylee's voice on the phone on the 24th. (Or was Casey doing an imitation off a bit away from the phone to concoct her cover story)
Mercury rules telephones, among other things, and Mars rules ex BFs!
P.S. I just noticed (smacking head!) that on the 17th/18th the transiting Sun was in opposition to transiting Pluto, and both were squaring her natal Sun... all the more worriesome, in my humble and amateur opinion.