Rule of thumb is do not handle for an entire week. You can even skip that weeks meal. Leave her alone. Then the next week, offer her a meal. If she takes it, leave her alone for the rest of the week. Offer her a meal on the next weeks feeding day. If she takes it, leave her alone lone for the rest of the week. Offer her a meal on the next weeks feeding day, and if she takes it, wait 48 hours and then you can start holding her for 5 to 10 minutes at a time and work up from there. (Basically, leave her alone except for spot cleaning and water changes until she's had 3 successful feeds in a row.) I know it's not easy, but it's best for the snake.
If you offer her a meal and she refuses, wait 5 to 7 days before offering again.