Some very very old women are so undernourished and dry and dessicated that depending on the environment in which they live (and die) there may not be a whole lotta decomposing going on.
Odd, but true.
No, the stench would come from when her internal organs, especially her bowels, started to autolyze and be broken down by bacteria. The stench of decay isn't form the body breaking down on it's own, it's from the bacteria breaking down amino acids to form "putrescine" and "cadaverine" which are the main culprits in the stench of decay. Decomposition can be delayed by cold, but not for 8 months.
It smells bad enough doing an autopsy on someone who has died within 24 hours. I can't imagine how badly this smelled.