This is where my theory comes in. I think it was a premeditated murder. Knowing that Dr. K was around "dead people" on a regular basis, (According to her statement), she probably could get her hands on formaldehyde, or other type of embalming fluid. I think they killed her, then carefully bled her out, (maybe in the bath tub) and filled those syringes with embalming fluid, and that's how they kept her body from rapidly decomposing. An embalmed body can last for weeks. Heck, they had the last Pope's body displayed for almost a month before they finally buried, (crypt) him.