You make a pumpkin craft instead!
Cut out some orange felt.
Using embroidery floss, hand stitch some curves of the pumpkin.
Lay on some ribbon and a button.
Munch on some Halloween M&Ms.
Warm up the hot glue gun.
Glue on some backing to hide all of the stitches.
Hot glue the pumpkin onto a headband or pin or any other decoration thingy you want.
Put some easy Pillsbury cookies into the oven.
Have your sister try on the headband!