Now, I bet you are wondering if that's just a complete oversight by me, and the answer is, yes. Absolutely. But! There's a very easy actual answer for this, that I'll probably write into the game now that you mention it. There's not a scrap of actual gold in there. Alexandra likes to talk tough, and act like she's better than the player in every way, but really, she just tried to make herself look as rich as possible, with piles of gold painted tin, and the like. She is just a low ranking member of her organization, after all, and that certainly doesn't pay in piles of gold coins, assuming it pays at all.