I believe that I read that her body temperature had already started to drop and rigor mortis had already begun.
JMHO
fran
http://www.deathonline.net/decomposition/forensic/timing.htm
Temperature
The temperature of a body can be used to estimate time of death during the first 24 hours. Core temperature falls gradually with time since death, and depends on body mass, fat distribution and ambient temperature. If the body is discovered before the body temperature has come into equilibrium with the ambient temperature, forensic scientists can estimate the time of death by measuring core temperature of the body.
Rigor mortis
The presence of rigor mortis also assists forensic scientists in determining the time of death. The body muscles will normally be in a relaxed state for the first three hours after death, stiffening between 3 hours and 36 hours, and then becoming relaxed again. However, there is considerable uncertainty in estimates derived from rigor mortis, because the time of onset is highly dependent on the amount of work the muscles had done immediately before death.