I had this problem with my BP, Severus. I found if I just monitored him that he was able to eventually get it down. No regurgitation happened. Although, I agree, it is stressful as an owner to watch. Do you feed in a tank or in a feeding box? I find that if you do put your snake in a feeding box, make sure there is ample vertical room so that when she is swallowing she is able to extend her neck and get the food down easier.