Prior to her "Please Don't Tell Anyone" scene with Jon in the last episode, there was quite a bit of evidence that they were trying to make her *look* like a potential Mad Queen, while actually giving evidence that she was NOT going in that direction.
Every time she had someone burned, from the slave masters of Yunkai to Randall and Dickon Tarley, it was supposed to look like foreshadowing that she was going to be a "burn them all" type of ruler, like her father. However, unlike her father, there were acceptable strategic and martial purposes to her burnings. Aerys would burn people for fun, basically, while Dany was using it as a legitimate means of accomplishing militaristic goals.
There were quite a few other instances over her character arc where she could have gone full "Let's Just Burn it All," but she remained calm and collected and handled things like a legit ruler, instead, deferring to her generals and aides rather than just unleashing the dragon fire at all times.
Of course, there were plenty of instances of aggressive pouting about "Muh Birthright," but she generally always reigned it in.
I think the previous episode was used to show a rapid deterioration of her previous self control.
