I want to see her go with everything that she wants, because initially, when we met her, she was just seeking what she wants, you know what I mean? And she was kind of in this lost, transitional period, where she didn't have a stable life. So I just want to see her get what she wants.She also admitted that she wants this to be "a final exit" and desires no cameos or future return appearances. Finally, here's how Gillian described the meeting with Moffat where they discussed what would be the best way for Amy to leave the show:
Actually, I called [executive producer/showrunner] Steven Moffat and arranged the dinner and then basically told him roughly when I wanted to go. He told me where the story was at and where it was going and then we kind of together came up with it. So it was really pleasant, actually. We had a lovely dinner and just kind of discussed what we both want and what's going to happen and then came to the decision. That was ages ago, so I've known for ages!
Why did you think it was getting to be the right time?
I wanted to go on a high. Also, Steven Moffat comes up with endless, amazing ideas anyway, but I wanted to make sure that I went on a high when the character was at her prime. There's just something quite nice and appealing about that to me. I don't know… It just felt right! I like to go on instinct.