I think we're all a bit in shock after that one. The Mad Queen has arrived. Barristan Selmy knew it was coming
"King Jaehaerys once told me that madness and greatness are two sides of the same coin. Every time a new Targaryen is born, he said, the gods toss the coin in the air and the world holds its breath to see how it will land."
Daenerys has chosen fear over love, and destroyed and slaughtered most of King's Landing. As far how that will pan out for her, we only have a week to wait before we find out. As Ramsay Bolton said once said "if you think this has a happy ending you haven't been paying attention. It certainly looks like that will be the case, judging by the devastation in the next episode's trailer