"Most likely, much in taxes, some in trade. Given her attitudes, doubtless some is the wealth of the conqueror." Her response is almost immediate. After all, she's given this plenty of thought. "What the kingdom trades is less clear. Crops, certainly, for there is surplus and I doubt it remains to rot in barns. And there are..." She hesitates a moment, trying to think of an appropriate term for the dildo-makers and lingerie dealers she's seen, and at last settles on, "...artisans. Craftsmen. Yet such dealings ought to account for a fraction of this wealth, especially where so little is given over to her subjects. My own kingdom had such trades, yet even at our height, such a feast as this would be a rarity, for a wedding or a new King's crowning, not merely to mark some contest and to deal diplomacy. She must be very thrifty, or very wise, in other regards, to afford such a party without falling into credit."

Yeah, her bet is that the Mistress owes someone a lot of money, somewhere along the line.