Answer:
4 1/2 exact, 5 cups if it needs to be whole cups
Step-by-step explanation:
Because she is making four pies, multiply how much is needed by 4. 1 1/4 times 4 is 5. Subtract 1/2 from 5 since that will be what she needs to use. This is 4 1/2, and 5 if a whole number since it would be 1/2 short if 4 cups.