I think we're supposed to believe, basically over 2 episodes, that she's lost all touch with reality. She lost the only advisor she unquestionably listened to (Jorah) and we've been led to believe that she harbors doubts about Tyrion (check the shade she's giving as he's yucking it up with Jaime in Episode 4). I think the writers intend for us to believe she thinks she's on her own, which makes her rash and unpredictable.
I'm well beyond caring what happens to Jon or Dany. They've basically murdered the appeal of the characters this season with almost nothing to show for it. Jon is now the dumbest, least gregarious character. We're supposed to believe Dany has lost all sense of reality over like 2 episodes in order to put the narrative where it's probably heading? Don't buy it. Arguably you could see her roasting the Tarley's as the first real evidence, but I don't think that was actually a terrible decision, despite what Tyrion says (you'd have to roast both of them - no way you off the dad and expect anything but treachery from the son).
Blame it on a condensed season, but Episode 4 was a complete and total waste - just criminally negligent lazy/sloppy writing. If either of them ends up on the throne in the end, I will be really pissed.
Just spit balling, since its unlikely they'll reveal why in the show, but it probably has to do with how they were turned and whether they were "resurrected". They do show mountains of corpses at the end of Episode 3, but not the disposal of them in 4. Some that were hit with dragon glass disintegrated and some didn't, prior to the Night King biting it. I think it's really more of a continuity problem than anything.
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