Instead of catching all food at once and putting it in a cell, the mother continues to collect food as the larva grows. Probably this helps protect nest from parasites, since mother keeps checking in on larvae. This progressive provisioning and care of young is a form of semisocial behavior. Note an element is the adult is caring for and remaining with the young as they develop. Another element is long life .
Some insect go one step further and macerate prey before feeding.
Associated with this is the progressive care of several young at the same time. N eed three elements to have true eusocial behavior cooperative brood care, all members share the same nest and cooperate in brood care. The behavior benefits her sister queen in allowing her to produce more offspring, and results in a greater production of nephews and nieces than her own sons and daughter. In order for altrusitic behavior to evolve, the sacrifice of fitness by an individual must be compensated by an increase in fitness of the individual's relatives in relation to their degree of relationship. So a female may have more of her genes passes on by rearing her younger sisters than by rearing her own daughters.