From what I understand, the officer did try to talk with her when she was on the side of the on ramp. She fled through the on-ramp traffic to the side of the highway. Unrestrained, the officer has to consider that she might, once again, cross against traffic, this time on the highway, putting herself and others at risk.
Then the headline would read, "Woman runs onto highway and the CHP officer did nothing to stop her."
PS, pretty sure running out onto the highway is a crime in CA. It is in Ohio:thumb: