4. She begins her turn thinking she's clear, but if you notice the angle of the shadows on the ground, she's turning directly into the direction of the sun and could/might be distracted from it.
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This is what I think is one of the most likely reasons this accident occurred. Obviously, being utterly distracted in the vehicle is the other possibility while she was making the turn; I noticed the van had multiple occupants and she kept on making the turn so either the other occupants in the vehicle didn't see pdamski also and not warn her to stop or they were completely oblivious also.
But glad it sounds like everyone was okay except the poor Model 3.