not shed for 3 months

my bp not shed for 3 months.the husbandry is right,she dont have eating problem(2 small mice a week).she is between 8 to 9 months.what do you think cause this problem?

I could be wrong but it sounds like she's just not ready to shed. My 9 month old BP recently shed after about 2.5 months. Seems perfectly normal to me :). Husbandry is spot on? Temps, humidity, etc? If so, I don't see any reason to worry (Unless someone more knowledgeable corrects me!).