Following is a post mortem report, kindly help interpret it

A body of a girl aged 24 was found floating in a well The girl had reportedly disappeared at around 1.00 PM and her body was found on the same day at 4.00 PM. The following is her post mortem report.
1. Both the lung are voluminous, water logged congested, a cut section excude froth with blood.
2. Abdomen stomach contains semi digested food material full of water with sand particles
3. One abrassion wound on right side of head.

Please mention the conclusions arrived at citing relevant scientific details and also the possible anatomical and physiological details

Interpretations:

1. She died due of asphyxia due to ingestion of blood into the lungs as proved by the presence of water in the lungs. Death by asphyxia and right side heart failure as shown by the blood and frothy fluid.
2.She was alive at the time she drowned as proved by the presence of sand in her stomach. This is to say she was not first killed and then dumped into the water.
3.An abrasion is simply a superficial tear of the skin. This could have happened while she fell into the well. It is necessary to know if underlying the abrasion there were deeper wounds.

Provisional conclusion: Death by asphyxia due to drowning.
(You cannot conclude homicide on these findings)

she was rendered unconcious by a blow to the right side of the head and drowned.