It's a corn thing when they are still looking for food as soon as the rat/mouse tail gets down their throat. In the first pic it looks like the food lump is to the right of her head and slightly above it. The second and third pics where you were trying to show her spine looks that way because of the bend in the snake and the way it is laying. Ideally you want the cross section of the snake while it is straight to resemble a slice of bread. They should be somewhat squared on the sides an bottom, the spine should be sunken down in the middle, and the two muscles that run down either side of the spine should be raised up.