She would need 45 Ft. of material. I hope this helped ^^
First, I multiplied the yards (2) by 3
Next, I Divided the inches (18) into Ft. which gave me 1 and a half Ft.
Then, I multiplied 6 Ft. with 6 and 1.5 Ft. with 6
Finally I added all of this together and got 45