i would take her one thing after another until you find something she will eat - plain yogurt, high quality canned cat food, mealworms, crickets, greens, watermelon - all along make sure you have the dry chicken feed available round the clock. i read somewhere that someone mixes a bit of buttermild with their chick feed as a special treat for their kids. Just don't leave that sit for too long or it will go bad.
Also, let her know you care, animals sense that. Get eye contact, tell her you are there to help her. If she's been neglected, she probably doesn't trust people, and you need to build that back up.
Good luck. We're all pulling for you!