Digital Spy caught up with Emer for a quick chat about her episode, her stint as Zsa Zsa and her new roles in the likes of BBC Three's Pramface and E4's Beaver Falls.
You're the youngest person to ever write an EastEnders episode - how does it feel? Is it nerve-wracking?
"I don't actually know if I am. I think I might be, but I'm not actually sure. You'd have to go through all the EastEnders episodes to work out who was the youngest!"
You must be pretty close, I would imagine.
"Yeah, I must be. Yeah, it is a bit nerve-wracking. I was really nervous before I started. You can freak yourself out with EastEnders; think about how many people watch it, how long it's been going, it's iconic. But since I've been on it, I've come to terms with it. But yeah, it's a big step... into a different arena."
>Can you give us some hints about the episode you've written?
"It's Lauren's story - Lauren Branning (Jacqueline Jossa). She goes wild on a night out in the episode before mine, and mine is sort of a hangover day - trying to remember all the things that she done. She's fallen out with Lucy (Hetti Bywater), she's upset with her parents, so it's her dealing with that."
"Actually, I was writing as I was acting - it was kind of simultaneous. I wrote on E20, which started this whole EastEnders journey. It's not like I was writing and then I got into acting - they have always been kind of together for me.
"What made me get into it? I think I was just reading a lot of scripts that... when I was auditioning for things aged 16 / 17, the female characters were always the girlfriend or the bitch and I found them really boring and uninspiring.
"I really wanted to create some of my own characters, then it became wanting to act the parts, then it sort of grew from there because I really enjoyed doing it."
Are there advantages to playing a character you've created? It must be easier to get into character?
"Yeah, well I knew [Zsa Zsa] inside out. I knew everything about her, so it was great."
You're writing for EastEnders now, but do you miss playing Zsa Zsa?
"I really miss playing the character, yeah. I really enjoyed playing her. She's so much fun. I really enjoyed being there.
"I don't really miss the life around EastEnders because it's so intense. It's so well-watched that… it's quite a lot… a lot of people recognise you. It kind of takes over your life.
"Whereas doing other little shows and little projects, you get just a little bit more space. It doesn't take over your life so much. I mean, I really did enjoy it, I can't complain. It's just different."
Do you plan to keep writing for EastEnders in the future?
"Yeah. I'd like to keep writing for little shows too. Keep practicing and keep it varied."
You also recently appeared in BBC Three comedy Pramface - were you pleased with how that show was received?
"Yeah, it had a really nice reaction. I went on Twitter while it was on. Scarlett [Johnson] who plays Laura is one of my really good friends and we were actually out in South Africa when it was on.
"We had a really weird feeling, even though we loved the show and loved the script. But yeah, on Twitter it had a really nice and really warm reception."
The show was picked up for a second series before the first had even aired, so that must have been encouraging?
"Oh my God, yeah. We were kind of worried about that though. We thought people might think, 'How can they know it's good before we've even watched it?" But actually... nobody really cared about that. It's just some funny TV for half an hour!"
You've also won a role in series two of E4's Beaver Falls. What can you reveal about your character in that?
"I really love my character in Beaver Falls. She's much more out-and-out comedy than I've done before. I mean, I've done comedy before in Pramface but [my character in that] Danielle is quite small, coming in once or twice an episode.
"But my character in Beaver Falls is a full-on crazy character. You're either gonna love her or hate her… which is quite exciting!"
What are you hopes for your writing and acting? Are there any particular roles you want to play or shows you'd like to write for?
"I really want to do more comedy, definitely. Acting-wise, I'd love to do something period. A period piece would be really, really cool to do.
"And writing-wise, I want to keep writing for young people. That's where I feel comfortable. And I want to write some more good female characters, but I don't really know where or how that'll happen."
Emer Kenny's EastEnders episode airs Tuesday night at 7.30pm on BBC One. Beaver Falls series two will air on E4 later in 2013 and Pramface will return in 2013.