That really sounds a very spoiled beagle, she sounds so sweet too. I noticed the main problem is when you are eating and she's trying to sneak out and that is not acceptable. You need to talk to your boyfriend regarding this manner for at certain level, your dog should treat you as a master and not on the same level as you or even she's the alpha of the group. Many people are trying hard to make their dog behave and become sweet as possible and you are lucky to have one, just not on all situation. Maybe you and your boyfriend should talk to a professional trainer or behaviorist together for him to see which are not should be tolerated for Luna.