HMMT November 2018 U11

Let $\triangle A B C$ be an acute triangle, with $M$ being the midpoint of $\overline{B C}$, such that $A M=B C$. Let $D$ and $E$ be the intersection of the internal angle bisectors of $\angle A M B$ and $\angle A M C$ with $A B$ and $A C$, respectively. Find the ratio of the area of $\triangle D M E$ to the area of $\triangle A B C$.