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How did she know that? The Kents knew Clark was sui generis, but was it discussed? He was advised to keep his powers under wraps, but why? In the original screenplay there was a scene of Jor-El explaining why he would need to keep his powers secret. The scene is missing here, and it occurs to me that there never was a good reason why Clark Kent and Superman needed dual identities. It's also a question why Clark waits to flaunt his superpowers. He walks all the way to Metropolis, where he demonstrates he can fly, stop a helicopter and a 707 from falling, and so on. Did he always know he could do that? How did he know? Did it take practice?
The wisdom of the comic books and the movie is that no attempt is made to explain too much. The device of the deadly Kryptonite is necessary because a superhero must have at least one weakness to give him interest. Other astonishments are simply designed to be accepted, as children do when told a story. He is Superman, he fights for Truth, Justice and the American Way, and that's that.