More details would help us to help you figure out what's going on. Is it possible she needs larger prey? She mostly sounds hungry to me...what are you
feeding? how often? What are her cage temps.? Remember that many female snakes (like BPs) get much larger than the males in order to reproduce
successfully, so instinctively they want to eat more. At 3 years, she is coming into adulthood (3-4 years) when she'd be able to breed, so I really think that
is what's going on here. We aren't seeing her though...her size compared to what you're feeding her would help to know, either photos or better details.