For f*cks sake. She's already deduced every piece of information she needs. She still can't connect the dots? Both "Asher" and Rain keep giving her tulips from the Royal Palace's garden. She's already narrowed down Rain's master as a noble from the Empire with power to rival Oscar/Isis' Ducal house, so Rain obviously serves the Prince, who is the only possible choice. And now "Asher" just told her he'll send a servant later. Who else but Rain shows up?
If Asher's servant is Rain, and Rain serves the Crown Prince... *sigh*