My take is, YOU are ASKING for trouble. Not intentionnally of course. The messing with the food idea is an oft repeated internet bit of advice I vehemently disagree with. Here is a link to what Dr. Ed Bailey, an animal behaviourist, has to say on a food aggression problem similar enough to yours to warrant consideration: http://www.thefreelibrary.com/The+im...e.-a0207744606
The short form version is, Lucy and the cats deserve their own dishes; there is no need for them to share their dishes or their food. More space too, certainly more than two feet. And, let the poor creatures eat in peace. Reaching into bowls (as per the linked article) and under bellies is threatening and only serves to confirm to Lucy that she is right, you are a threat that might steal her food.