Trying to think outside the box here.
**WARNING** Some graphic details
The one thing I see for sure here is failure to provide critical care, and I do expect we will see some sort of charges along that line.
I also think we will see charges of improper disposal of a corpse, gross abuse of a corpse, Failure to report a death and a whole slew of charges due to the fake kidnapping. Who knows, maybe even arson charges.
I don't know if Zahra's death was violent or not, I can come up with many different theories.
If Zahra's body was in her bed after death, laying against the length of the wall....human decomp. would be present on those walls....only visible with a forensic light source (all bodily fluids illuminate, that includes fluids the body excretes after death).
The body also expels normal fluids after death, feces and urine. That could have happened when removing her from the bed...the reason the floor was cut out in that area.
I have had a nagging question about how Zahra got in and out of the bathtub. I have wondered if she was ill and week, put in the bathtub and ignored and drown. Or maybe EB and AB were having a violent fight (thinking about the fist holes in the walls) and Zahra tried to get out of the bathtub, hit her head and drown.
The spot on the floor could be from moving her body from the tub to the floor in the bedroom and doing a botched job of CPR (causing significant damage to Zahra's body or maybe even causing her death). She may have then been placed in the bed while they tried to decide what to do, her body laying up against the wall.
Just trying to think along the lines of "we really didn't kill her". It just tells me that they did not willfully kill her, but they are responsible for her death. Negligent homicide.
I'm certain that Zahra's lifeless body lay in that bed for over 24 hours.
Just another note. The body swells after death. If Zahra was still wearing her prosthetic, it may have become difficult to remove - which could have been the trigger for the dismemberment and the reason for that spot on the bedroom floor.
Bloat
The bloat stage provides the first clear visual sign that microbial proliferation is underway. During this stage, anaerobic metabolism takes place, leading to the accumulation of gases, such as hydrogen sulphide, carbon dioxide, and methane. The accumulation of gases within the bodily cavity causes the distention of the abdomen and gives a cadaver its overall bloated appearance[6]. The gases produced also cause natural liquids and liquefying tissues to become frothy[4]. As the pressure of the gases within the body increases, fluids are forced to escape from natural orifices, such as the nose, mouth, and anus, and enter the surrounding environment. The build up of pressure may also cause rupturing of the skin[6].
creidts:
http://en.wikipedia.org/wiki/Decomposition
Just something to think about, I have not formed a strong opinion as to what may have happened to Zahra, there is too little information to come up with a knowledgeable opinion.