If I may chime in here....
I tried the chicken broth with mine when she was being finicky. It just freaked her out. what got her going was a little dirty gerbil bedding that I got from the pet store where I bought the frozen rat. I put some on a paper towel in her tank about an hour before I fed her. When I was warming the f/t rat, I put some gerbil bedding in the baggie for a marinadeWorked like a charm. Now she takes them with no additional nudging at all.
I have to disagree with the post saying that you should always feed them live to start and then move on to frozen. I don't see why you would want to endanger your snake in such an avoidable way. But that is just my opinion.
Also, sometimes moving the snake to another enclosure for feeding can just stress it out even more. If she's a new one, just feed her in her home, lay some paper towels down on the substrate if you're concerned about ingestion and use hemostats if you're concerned about getting chomped.
Good luck. It can be very stressful for the owner when the little lovelies won't eat. Keep us posted.