Even if you did react in time, her reaction time and/or brakes may not have been as good, and you didn't leave any buffer for errors.
Not really worth tailgaiting and weaving, doesn't knock much time off your trip.
You've never squeezed into a lane to take an exit? The buffer between herself and I is HER responsibility and she had adequate time to make one. Especially at 60km/h. Brakes not being good or whatever thats her problem.. The reason why I had to stop was because traffic ahead had already come to a halt it was her responsibility just as much as mine to pay attention to that.