Agreed with the hook training! I have a female with a super strong food response as well. Eventually all you will need to do is touch your boa with it and she will know she's not getting fed.
That said, she's on a every 14 day feeding schedule, and I have other snakes on 5 and 7 day schedules so many times she can smell f/t rats thawing and will go into food mode even when she's not due to eat. I have learned (the hard way) to make sure that I clean the enclosures before I start thawing rats for whoever is eating that day.