Which driver was in the wrong here?

Today I was helping my sister drive in the street since she is still learning the ins and outs of driving. She got to an intersection which turned yellow just as she got to crosswalk and passed the intersection while it was yellow while going slightly below 35mph. On the other side of the intersection was a car... show more Today I was helping my sister drive in the street since she is still learning the ins and outs of driving. She got to an intersection which turned yellow just as she got to crosswalk and passed the intersection while it was yellow while going slightly below 35mph. On the other side of the intersection was a car waiting to turn left. Around the same time that my sister crossed the intersection (while it was yellow), that driver attempted to make his left. My sister freaked out immediately but was able to maneuver around that driver and safely made it to the other side of the intersection with no incident. Who made the mistake in this case?
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