A wheelchair bound student and her friends fend off female zombies, whilst trapped in a cabin, however she soon discovers her friends murdered them - and are seeking revenge.
It's a cool concept. Well done.
We've got a trapped scenario/crucible.
A unique character - there's plenty of empathy for wheel-chair bound zombie fighters.?
A live or die scenario.
A fish out of water (she's surrounded by zombies and murderers and she's like the only normal one).
A dilemma - get killed by zombies or fight alongside the murderers.
A twist/hook - her friends are the murderers.
So yeah...
Good luck.