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I had this scene when I was being sent off to Dorne, and I was in my little boat, I had to cry during that. Which, well that was my last day of filming for Season 2, I knew I wasn't coming back for a while. So I was already feeling emotional about that, and I then I just kind of thought about what she [Myrcella] would be feeling. And she wasn't going to see her family for, maybe, years. And then ...
Aimee Richardson was not originally intended to be permanently cast as Myrcella: no casting decision had been made yet, and she was simply a stand-in for the auditions involving other cast members, such as Cersei and Jaime. However, the TV series creators discovered that they enjoyed Richardson's strong acting ability for her age, so they decided to officially cast her as Myrcella.