What was Sandy thinking?

First of all, she follows a kid into the woods who is clearly disturbed.

Sandy's going for a walk in the woods. What does she wear? Some open toed high heels. When her ankle was hurting, that should have been the clue that maybe she should have changed into tennis shoes.

Then she sees a pit of carnivorous monsters and decides to get up close enough to slip.

I was expecting her to be the "final girl", but then she had to go and break a bunch of rules for surviving horror movies.