Shes probably just maturing.
BPs will randomly go off feed for many reasons, hormones, temperture changes, moving, etc.
Ive had males and females go off feed for months, ill still offer it feed weekly and just suddenly one week they will take it and after that will never miss a meal again until they decide to "fast" again. Usually my males more so than females (unless breeding) will fast for a few month out of the year.
Are you feeding live prey or frozen/thawed?