Since her friends' birthdays are completely independent of her own, each of them has a $\frac{1}{7}$ probability of being born on a Tuesday, and a $1 - \frac{1}{7} = \frac{6}{7}$ probability of not being born on a Tuesday. If exactly 2 friends were born on a Tuesday, the probability of this occurring is ${3 \choose 2} \cdot \frac{1}{7} \cdot \frac{1}{7} \cdot \frac{6}{7} = 3 \cdot \frac{6}{343} = \frac{18}{343}$.
Amy was born on a Tuesday. What is the probability that exactly two of her three best friends were also born on Tuesday? Express your answer as a common fraction.