Next thing you may want to try since it is a very small animal is to keep her in breeder setup condition since this is how it was kept until very recently and do so until she eats for you a few times consecutively.
I have seen a few times with some of my customers, they receive the snake have it in a small tank and it just does not work, once they set it up in the conditions I keep my hatchlings in , their animals start eating for them and once the animals feeds with consistency they move the animal back in the tank.
If that is the case and it's still a no go when it comes to food try this
6 quarts tub
Aspen bedding to allow the animal to burrow
6 inches plastic flower pot saucer
88 on the warm side
No handling for a week, and a week later live mouse (small adult)
When you offer the food do it in the enclosure drop the prey and move away (remove if un-eaten after 15 min)
That's how she was kept before me. I've had her for almost a month at this point in the 20G tank. I'm going to bring her to the vet sometime soon for a general exam and to see if she's sick or something.