To find the unit rate, we can divide the number of cookies by the number of scoops of flour. The unit rate is $\frac{70 \text{ cookies}}{7 \text{ scoops of flour}}=10 \text{ cookies per scoop of flour}$. So if Regan uses 13 scoops of flour, she can make $10 \times 13 = \boxed{130}$ cookies.
