just a guess but maybe she hasnt defecated because she is ussing all of the food u give her. My bp is 20" long and i feed her FT adult mice in the 25 - 35 Gram range. she wieghs 160 g. i was like u, i started out feeding my bp too small of a meal for the first two meals. then i put her on the adult mice and she has really gained wieght sense. she gains at least 20 g each week or from one feed to the next i can expect at least a 20 g gain.