True but each of those times her violent outburst felt grounded. Character A does a very bad thing to Danerys, and she reacts. It made sense to her character. Kings landing didn’t, because the people of Kings Landing cheered her arrival. Cersci was not popular and about to fall anyway, Danerys could have had what she wanted, Westeros and the love of the people.
To make her turn work Cersci needed to fall before Danerys got to Westeros and someone likable is on the Iron throne. Now the people want to hold onto their new monarch who saved them from Cersci or have Cersci turn likable. She had a rough start but through experience becomes a good leader only to have Denarys dethrone her. Something other than RING THE BELLS.