please ignore any biological innacuracy, i know bees dont work that way, but im a what if guy, so have at it.
one day Vi woke up feeling weird, stronger, more royal. when she returned to the Bianca's hive to investigate her condition, it was discovered that she was fed with royal jelly at first, but then switched to the same food that all other bees had.
this reappeared later in her life, as her body started mutating during the night. she is slowly transforming into a queen bee and soon she will need to leave to start her own hive.
this started as an idea of Vi having stinger for legs and her leg as a stinger.