The Diner.

They ate voraciously. The feast, right there. No need for pheromone trails. The sisters gorged themselves on the shed skin cells and sebaceous gland secretions.
Their colony, thankfully small at present, was destined to explode once the new queen resumed production.
The compact structure of the new nest, with the ready source of waxy nutrition, had been quickly discovered but the food would not last. This wasn't a concern for the ants though; burrowing deeper into the canal revealed a much more abundant supply of edible tissue. Undoubtedly the young girl's headaches would become Intolerable but that would soon pass.