Shift 1:
"Come, Minion!" One hand on the imp's shoulder, Miran drags the creature along, not really caring whether it wants to follow or not. In passing, she nods at Rahal and smiles with approval. Someone is getting the idea that we need to fortify, at last! The vampire starts moving rocks toward the entrance stairs with the aid of the imp, piling them up until they block the entrance. She intentionally places some rocks on top that will fall off with the slightest provocation, warning the dungeon crew of intruders trying to get past.
Barricade entrance
Shift 2:
"... and that's the kind of sprout I need." Miran concludes, showing the imp the last of the ingredients that go into the healing powder. "Now go get to it! Gather some, but not from the herb garden over there. I'll be watching you," she lies, and turns over in her coffin. The lid slams shut with a soft thud.
Take a nap
Shift 3:
After tracking down the imp again, Miran gives it new orders, regardless of the success of previous attempts. She is a vampire, undead nobility! Of course a lowly imp will obey her! "...so rats, snails, fish, turtles, snakes, whaterver. Just bring them to me. I'll hunt in the other part of the cavern!" In her mind, she goes over her recipes for the vermin stew she will prepare if she still has time to after catching the ingredients. As usual, she'll drink their blood first. What little brains they have will go to the tentacle-mouth with the unpronouncable name, while the meat will go to the ghoul.
Hunt vermin for food, drink its blood, cook the rest if there's time and feed the others.