Definitely not an issue with the feeder size I have a superfly that is about half the size of her and it put down an identical feeder with no problem. I fed two days after receiving her (shipped) I am thinking it was just to soon for her with the move. Two of the others that came in the shipment fed just fine but they are also bigger and older snakes than she is .... I'll just wait and try again next week, I'm not really concerned as much as I am confused. I was under the impression that if they strike and wrap it is usually a done deal. Although I know there are always exceptions ...