It's the question that filled our minds once Daenerys landed in the Dragonpit.
EW spoke to Lena Headey (who plays Cersei Lannister) about the major eye daggers towards the Mother of Dragons in the season finale.
“I think she’s immediately envious because Daenerys is more beautiful and younger than she is and the prophecy says somebody younger and more beautiful will take her place so I’m sure that’s at the forefront of her mind,” Headey said. “And Tyrion is her Hand, so she couldn’t be any worse.”
What about Cersei’s big lie? Remember her 'pledging' to help Jon Snow while building up her forces to crush him instead. “I think her lie will be very shocking,” Headey mentions. “She’s such a bitch. She’s so unforgiving of everybody.”
After seven dramatic seasons, don't we know Cersei Lannister by now?