Bicycle crash at San Ardo

Last weekend my husband and I went to San Ardo with plans for him to do the road race and me to ride the race course in the opposite direction with my girlfriend who's husband was also racing.
Everything went according to plan and my girlfriend, Sharon and I were having a very nice ride. Every now and then one of the racing groups would pass on the road going the other way, always observing the "centerline" rule. The centerline rule means that just like a car, you stay on your own side of the road. Only in a bike race that also applies while passing.
As I said everything was going great, we were having fun, waving to the occasional person we knew in the race. No problems at all until we got about 3-4 miles from the finish line of the race. This would be about 18 miles from the finish for the racers since we were traveling in opposite directions. We were out on the rolling part of Paris Valley Rd. in a flattish area with good sight-lines. We saw a large group coming toward us very fast so we knew they were either CAT 3 or Pro/1/2 riders. As they got close the riders in front began pointing us out to those behind. We were as far to the right of the road as we could get. At this point racers in the back decided this was a good opportunity to move up in the pack so they moved over the centerline and right in line with us. We had no where to go other then into the star thistle on the shoulder of the road or into the racers going at least 30 mph. At this point Sharon stopped and I having no other choice ran right into the back of her. She flew over her handlebars and landed on her face, I crashed onto my left side bruising my hip and getting road rash and bruises on my leg and elbow.
Fortunately we're both alright but unsatisfied as it looks as if the perpetrators are going to get away with it.