Apocalyptic Warfare

An 18 year old girl broke out of an Institution 14 years ago with her best friend Sarah. But sadly, Sarah was caught by some unknown creature, and was bitten. This bite affected her deeply, causing young girl Sarah to morph into some mismatch creature. So now the escapees became one escapee. One day, things go from looking good, to disastrously bad.. Will everything work out? Or will the escapee be stuck back where she started?