There are two ways to react to the unknown - be frightened and run (even if it's around like a chicken) or be curious and investigate. At her age, it might be better to be frightened and run (not like a chicken, though), but with time and your guidance, I'm pretty sure that the experiences she'll have and the concepts she'll learn will make her more curious than afraid. Which then could lead to a whole different set of problems... But I'm quite sure she's in good hands no matter what problem arises.
Frightened and run depends also - sometimes it is the best response for everyone. The "gift of fear" is real and can be used to keep us alive. However, it is also situational. Evaluating the situation helps. Some people seem to walk around as if all places have the same risk profile. Which is highlighted by how many people put themselves in bad situations.
Of course, and evaluating a situation is based on the experiences that one had. The more experiences, the easier it is to do the right reaction - which sometimes is running, and fast. But there is a difference the chicken run and the conscious running. One is the people running away in a straight direction in front of the car chasing them, the other is the one changing direction and using objects where the car can't follow.
Our kids are under our wing for a reason, which in this case is to guide them through experiences, just like you're doing. The sad thing is that most people don't see it that way anymore, and try to shield them from experiences, creating immature beings.