I'm with Mike on this one. Some species may need "taming" in the sense that regular handling keeps them more tolerant of you, but BPs do not need regular attention.
She tagged you because you either startled her, or she knew it was feeding day. This is the #1 reason that I think it is totally illogical to feed in a separate enclosure. Why would you want to reach toward a hungry snake on feeding day? How does handling her before feeding her (when the room smells like rodent) and then handling again after feeding (when she is in feeding mode and EVERYTHING smells like rodent) teach her that handling ISN'T related to feeding? I never handle on feeding day unless it is absolutely necessary, feed all 30 of my BPs in their home enclosures, and have never had a "tank aggression" issue. Same goes for the 20 years I fed my boa in his tank. (rant over)