There are a lot of different things to consider when it comes to water decomposition.
- "If a body is left submerged in water the rate of decomposition will typically be much slower due to the low temperatures and levels of oxygen..." Decomposition – The Forensics Library
- Decomposition is slower overall in water than in the air, but the rate in the water also depends on what type and temperature of water it is. Decomp is faster in warm, freshwater than it is cold, saltwater, and it's also faster in stagnant water than it is running water. Skeletonisation can also happen in just a few days depending on predatory marine life: fish, crabs, etc. Putrefaction | Forensic Pathology Online
As horrible as this part is for us to consider I was thinking fish might play a part in her decomp. They tend to gather around these landings and bridges and with that window being down they’d have no problem getting to her. 9 months is a long time but on the other hand not that long in terms of decomposition right?? Ugh like you said @Chelly I can’t bring myself to google these things.