Stellar Rebirth: The Rise of the Queen

The female protagonist is reborn on a desolate planet.
With a kind heart, she saves a man who crashes his spaceship and is seriously injured. Years later, that man becomes a Marshal of the Empire, the object of admiration and worship of billions of citizens. It is well known that the Marshal has a beautiful and gentle fiancée, who is said to be his savior. He dotes on her endlessly, spending fortunes and causing countless people to envy, adore, and hate her. Unfortunately, the fiancée is not the female protagonist, but an imposter.
How will the female protagonist drive away the imposter, endure countless hardships, suffer physical and emotional torment, and finally prove her identity? Only then can she live happily with the Marshal.
Female protagonist: ?
She decides to escape this ridiculous plot by hijacking a spaceship and running away.
...
In order to become stronger and make money, she heads to the chaotic and dangerous Dark Star.