The actress's character Katie Sugden has a major role to play in the 40th anniversary special, which takes place on the day of her wedding to Home Farm boss Declan Macey (Jason Merrells).
Winward and other Emmerdale cast members have already admitted that they are nervous about the challenge ahead. Show bosses have lined up 11 days of rehearsal for the live broadcast, aware that anything could go wrong on the night.
Confessing her main concerns, Winward told The Mirror: "My biggest fear is corpsing - just starting to laugh and not being able to stop. It happens all the time when we're filming. We can be in fits of giggles for 15 minutes at a time which drives everyone mad - but I'm hoping I'll be so scared this time I won't dare.
"And, like all actors, I've got that fear of forgetting my lines. I keep having this dream where I'm on stage and I don't know what the play is we're doing. It's horrible. Oh, and I'm really clumsy too - I've already fallen over twice today, so who knows what I could do.
"So yes, the sleepless nights have started already. Put it this way, I'm going to be stocking up on Rescue Remedy and relying on my friends to help me through."
While one character will be killed off in the live episode, Winward hinted that she would like Katie to stick around for at least a few more years.
She said: "I started in the show when I was 15, so I've grown up here and the people I work with are my best friends. I only came in for eight episodes and I'm still here.
"When it was the 30th anniversary, it felt very much like I was one of the newcomers, now I'm lucky enough to be a big part of the 40th and who knows, I might be here for the 50th too."
Emmerdale celebrates its 40th anniversary next month.