It really depends on the individual personality of the snake, I've got some that will eat whatever I put in front of them and some that are more finicky. All you can do is try. ScottyDsntKnow gave some good tips on trying to switch. Also you can try waving an ASF in front of her face and then before she can strike swap it out for a regular rat. Time of day also seems to make a difference, I've had more luck getting reluctant feeders to feed in the evenings rather then in the mornings.