She's about 66, in overall OK health, Twenty years ago, this would make her about 76 now. Sort of. But more 20 years ago, I would classify 66 at old enough to know that death is a significant possibility at any point in life. This would reduce the probability of death by some trauma.
but I put in some clues as to her upcoming stroke - migraines for instance. Here I have to warn you I'm not terribly sure of this, but I believe migraines are a condition in and off themselves. They may cause transient ischemic attacks (TIAs), which may also be caused by strokes. Strokes are caused by one of two conditions: either a blood clot blocking the flow of blood, or a rupture of one or more blood vessels in the brain.
Strokes caused by blood clots can be proceeded by smaller clots blocking smaller blood vessels. These clots cause a loss in function in the area of the brain that is being blocked from blood flow. If the clot is small enough, the clot on its own can break up, allowing blood to reflow into the area that the clot had been blocking.
These clots will cause, if they break up, a temporary loss of function, causing things such slurring of speech, loss of strength in one side of the body, and facial droop. My understanding (and not much of one) is that migraines can cause similar symptoms such as these, and all are labeled TIAs, although from different causes.
I believe that headaches with strokes are caused by broken blood vessels, which cause an increase in intercranial pressure.
Most noticeable signs of mini-strokes (TIAs) are things like slurred speech, sudden lazy eye, facial droop, loss of strength in one side, and coordination problems.
Blood pressure higher than normal. Okay.
Since the story takes place in L.A. in April, the air temperature is in the 70s. That's what I was thinking. Remember that when we're talking air temperature, we're talking the air temperature of the room in which she is found. Decomposition would be progressing at a reasonable right. Odor might be present, although probably mild, and the face would have begun to lose form to the point where ID is going to begin to become difficult. It's not going to be terribly obvious to people who haven't seen dead bodies before, but it will be noticeable to someone looking closely.
She's found toppled over on the couch, Toppled over the couch has many interpretations. She could have fallen forward from sudden onset and ended up there by dumb luck, she could have been trying to get to the sofa as she felt the stroke coming on, she could have been sitting and gotten to her feet as she felt the stroke coming on, her body might have spasmed in the death process, or it might be how her body ended up as her body relaxed in death. In other words, body position is important and is going to be one of the most important initial clues in determining whether this death is suspicious or natural. Starting point will be whether she is face up or face down.
about 24 hours after death. Rigor will have set in and most likely be complete, with maybe some release to smaller facial muscles like the eye lids. Lividity would be pronounced with significant discoloring of the lower points of the body. The balance of the body would be very pale compared to life. This paleness is significantly influenced by the person's natural coloring, but is easily identified with a minimum of experience.