I'm sorry, but no. Going over 30 mph does not make this her fault. And becoming "wobbly" at slower speeds is not the reason riding faster is preferable and safer on these stretches. It is because the biggest risk is the car closest to you, i.e. traveling in the same direction as you. The faster you are going, the smaller the delta in speeds, the less likely you are to be hit, and the less likely you are to die from the impact when you are hit. Driving at lower speeds because you are worried about the cars in the oncoming lane puts you at greater risk to the greater threat. And 30mph is not fast enough to negate your ability to react -- unless of course the situation does that for you in its entirety.