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IMO, her fault because she clearly didn't do a mirror check or she would have seen him. However, he was going much faster than I would split... which would be ok if he had a bit more control of his bike. I don't know if the video creates the wrong impression, but it looks like he had plenty of time to shave off more speed and plenty of space to turn more.
I'd have started shaving off speed the moment I saw her indicators go on and then would have intensified the braking as soon as I saw her car begin to turn. I think I'm being slightly deceived by the video though... it was probably all happening faster than it seems watching it after the fact. He's ok though which is good!