I don't live in AZ, but I work with Medicaid in my state. Based on what I've read, she would have qualified in my state for home health services. Part of the home health aide's job is to help the person access the community. That could include driving them to church if they are someone who normally goes to church. If the aide received a text from her saying, "I'm not feeling well, don't come pick me up," they wouldn't necessarily think anything was amiss. Of course, that relies on someone knowing her routine well enough to know to cancel the aide. Or points to the aide themself.
Or, maybe she ordered a Uber or a Lyft, and the just didn't yesterday morning. Or maybe the church has a bus that picks people up and she just didn't come out so they left.
why are so many people assuming she doesn't drive? my grandmother has mobility issues, she probably can't even walk 50 yards like nancy reportedly can, but she still drives.