In a distant future the Milky Way’s Sun dead, which China has used as an opportunity to initiate a global take over. However a young naive scientist discovers a way for Sun crisis to be solved, thus making her a target on a global scale and initiating WWIII.

* Life source

Okay,

A distant future where the earth's life force has died. A secluded scientist has discovered a way to create another Sun. Her findings however hinder a nations goal for global supremacy.

tried not to use the word "sun" to much
Maybe something along those lines but better.

I guess I'm not clear. The sun is already dead. the problem being solved is in fact a "new sun" I imagine in the first 10 minutes of the screenplay i setup the fact that the sun dies and what happens to the world, then afterward is the post apocalyptic scenario.

I really like the "hinder a nations goal for global supremacy"

I feel like I still explained that roughly.

Anyhow the character flaw is naivety and daddy issues basically I imagine. It may change though. The naivety isn't with science but with the state of the current world (seclusion) comes into play as well. Lemme know what you think thanks alot.