Clothing for petite "DD" cup

Does anyone have any idea where I could find clothing for my step daughter, she is 19, she is 5"3" wears a size 7 jeans and has a natural "DD" bra size. I am finding it difficult to find any dresses or any of the cute new styles that she can wear. Being pettit with a larger cup size makes it extremely difficult to find clothing... Help me please....