Total Film's list of the 50 Most Badass Female Horror Leads - you can see her position here, but BEWARE, there are major spoilers for Severance if you haven't seen it yet!
The rest of the list also has spoilers, plot details, and mentions if the lead makes it to the end of the movie, so obviously tread carefully.
I'm really glad she made it in, I work hard to have a good mix of characters, male and female, and as my first ever badass female lead in my first ever movie, I think she's a damn cool one. Much kudos to Laura Harris for her fantastic performance.
If you haven't seen it yet - how the hell have you avoided it? It's been on TV about a million times! If you somehow missed every broadcast, well, it's on Netflix, and Amazon Prime, and probably most of the other streaming/subscription based services.
Or you can grab the DVD in the UK for a few quid, and on DVD in the US, or on iTunes. Buy it used/second hand if you like, it's all good - I'd much rather you did that than downloaded it illegally, and it means an unwanted copy gets to go to a loving home. Slasher movies are for life, not just for Christmas.
Update: Severance also featured in Total Film in 2012 as one of the 50 Greatest Indie Horror Films, making it into number 36. You can see that entry by clicking right here.