nah even before she came to westeros she showed that she could be brutal.
she crucified like half a city. burned a ton of people alive. fed a couple random dudes to the dragons just to send a message.
her advisers have kept her on an even keel, then she got to a point where she stopped listening. they've been building this up since season 1, it's just that this season is rushed af so everything seems abrupt now.
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