You can buy a drop trap online. They are expensive, so a crate and pole will work as well. You will need two people though, as the crate may bounce up when it hits the ground. Someone needs to be close enough to hold it down.
You can also use a large carrier for trapping but, of course, only if she'll go in it. Tie a length of twine to the top of the door, the side away from the hinges. Lace the twine through the holes in the same side of the carrier, at the top. Bring the other end of the twine with you to your hiding place, leaving the door open and the twine loose.
Put the food in the carrier. You may have to put it towards the front and gradually move in deeper into the carrier as she gets used to eating there. When she is finally eating at the back of the carrier, you can pull the twine and close the door. Again, you or your helped must be close enough to the carrier to secure the door before she bolts.