Both runners out. Batter/baserunner looks back and sees the ball is going to be caught and drifts into the path of the throw (whether or not it was intentional doesn't matter) and thereby interferes with the play.
I don't see much, if any, drift. When struck, her left foot is still a foot or less from the foul line. Also, she was hit on the LEFT shoulder. So assuming she did drift to the right, that actually decreased her chances of being hit since she would've been hit more squarely in the back by not veering (if in fact she veered).
The more I read and discuss, I'm back to saying one out, no interference. There's nowhere for the runner to go. She's in a position that is reasonable for a batter/runner - foul territory on a path toward 1B. There is no proof/evidence of intent.
And while this might not be a factor in how the play should be called, why should the batter/runner be penalized for running to first, and why should a bad throw be rewarded? F2 had all day to get the ball to 1B for the out. The runner on first was almost at second when the ball was caught. Then the catcher throws a ball into the back of the batter going running toward first in foul territory.