Interesting. That's highly abnormal behavior for most kingsnakes. I'd say that the change in attitude is an indication that the snake is stressing out big time on something, although the voracious appetite may be an indication that there's more to it.
Has there been any notable change to the snake's environment in the last month or so? Have temperature, humidity, lighting, accessories, hiding places, water dishes, etc. been changed? Has the enclosure been moved? Has there been any change in the "technique" you use when handling the snake (aside from the gloves)? Do you feed live mice, and if so, could she have had an "ugly" encounter with a feisty mouse? (In fact, are you sure she's a she?) Has there been an increased level of activity in your home lately? Any other new pets recently? Is her container close to an AC unit or something that might create a lot of vibration? Sounds like she's sensing something she doesn't like - something that wasn't there before, but is there now.
Here are some ideas: One, DO NOT even attempt to handle the snake within a couple days after eating. Gloves or no gloves, the snake needs at least that much time to kick back and digest the food; any disturbance or source of stress at this time could lead to regurgitation, and possibly even harm the snake. Two, toss a temporary cover over the enclosure to give her some extra privacy. If she's stressed out from some external stimulus, that might help settle her down. Three, watch her closely on a daily basis, and if you can do it without being overly intrusive, inspect her for any physiological changes that might indicate illness or disease. Four, get rid of the gloves. They'll only add to the snake's already elevated stress levels. Finally, continue to try handling the snake at proper times (not after a meal, and not during shedding cycle) - gently, without restricting her movement, letting her move freely between your hands/fingers, no sudden movements but keep everything slow, soft and gradual. The idea is to regain her trust, let her know that you're not a threat, and minimize any and all sources of stress.
Mope this helps. Keep us posted, michaelb