Because she's out of touch with reality. She thinks that gold can buy anything, and doesn't get that there's not enough gold in the world to get anyone to sign up to fight a dragon. Bronn won't do it, neither will any other sellsword, and her vassals won't be showing up when called. Or maybe she's overconfident because she still has Euron, but Euron's ships are all made of nice flammable wood (that should be Dany's next move, finding his fleet and burning it to the waterline).
And she does seem to be one of those people that just won't give up even when they're beaten because they can't wrap their heads around the idea of defeat, and she certainly won't give up to spare the lives of her supporters because she doesn't value the lives of her supporters. There's a good chance she'll try to pull an Aerys and blow up King's Landing rather than surrender it.
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