What is the weight of your female? While most female bp graduates to a medium rats, I think it depends more on weight than on age. In other words, being 1 years old matters little as you may have a small female who may not have started out or had a habit of being a picky eater.

Nonetheless, if your snake was eating fine before the fast, barely lost weight, husbandry is on point and she appears active only at night, I would save your worries for later. It is not unheard of with 8-9 month old bp fasting or even some as old as 5 years or more, so age is not a good determining factor. Keep in mind that wild bp usually eat for a season or two when prey is plentiful and then go on a fast for the remaining year when the seasons changed. Breeders have yet to breed this instinct to fast out of them.

If it makes you feel better, my male had been off food for 4 months (Or is it 5?). He barely lost weight.