Firstly, there is no evidence this body was dug up three days after death. Not only that, bodies of dead non-Muslims have been dug up as early as three days before (some on the same day) and no such 'punishment' or deformation of the body has ever been mentioned to my knowledge.
Secondly, after reading a bit about human decomposition after death, judging from the pics, it's pretty clear the body is in Putrefaction stage where
Odor, color changes, and bloating of the body during decomposition are the results of putrefaction. The lower part of the abdomen turns green due to bacteria activity in the cecum. Bacteria break down hemoglobin into sulfhemoglobin, which causes the green color. A formation of gases enters the abdomen which forces liquids and feces out of the body. The gases also enter the neck and face, causing swelling of the mouth, lips, and tongue. Due to this swelling and misconfiguration of the face, identification of the body can be difficult.
http://en.wikipedia.org/wiki/DecompositionI mean no disrespect there Islame, but do your aunt not know this being a doctor?