would you please tell me how I can write  what I mean in this sentence?
she has a perfect insight into not wasting human being's lifetime.

I mean she never wants to waste her lifetime .

The second one sounds better! :) Are you looking for a different way to say it?

I'm not sure what you mean by "human being's" - hers or someone else's?

If it's hers, you can write, "She doesn't want to waste her time on this earth."