Primal (2010)

Dace is working on his anthropology thesis and brings a group of friends to a remote location to find cave paintings that have not been seen for one hundred and twenty years.

They set up camp and Mel decides to go swimming.  Bad idea because the water is full of leeches and they attach themselves to Mel.

As the night goes on, Mel gets a fever and her teeth start falling out.  The others decide she needs to go to the hospital. But insects have begun to consume their vehicle, starting with the tires.  I don't know about you, but if bugs were eating my car, I think I'd high tail it out of there on the rims rather than wait around.

By morning, Mel has turned into a razor toothed monster and starts attacking her friends.  Too late they figure out the cave paintings are a warning and now they need to figure out how to survive crazy Mel with her razor teeth and her super human jumping abilities.