Heartbreaking! Reborn as the Four-Year-Old Qin Princess, I’ll Save the Qin Dynasty

You guys, get this! A college student stayed up all night revising her thesis, and after hours of work, everything went black. She dropped dead on the spot. When she opened her eyes again, she had somehow transmigrated to the Qin dynasty in 215 BCE, becoming the four-year-old Ying Heyua, the youngest daughter of Qin Shi Huang and the younger sister of Prince Fusu! As soon as she arrived, a “ding” rang out in Ying Heyua's mind: the Great Qin Defy Fate System had successfully bound itself to her! Signing in unlocked all kinds of wondrous items, from modern high-yield crop seeds to advanced forging manuals. It had everything. The Qin palace was treacherous and fraught with danger; one wrong move could mean utter ruin. But with her knowledge of history and the System's “high-tech” tools, Ying Heyua wasn't worried at all. She brought out high-yield crop seeds to solve Great Qin's food crisis, then used the forging manuals to improve its weapons and dramatically boost the army's combat strength. Qin Shi Huang and his ministers were left speechless with astonishment. At first, Ying Heyua only wanted to use what she had learned to help Great Qin overcome its difficulties. She had never coveted the throne. But what could she do? Her father doted on her, doted on her, and doted on her some more. Along the way, Ying Heyua used her intelligence and the System's help to make friends among the talented and escape danger time and again. Qin Shi Huang came to greatly admire her abilities and courage, and she won the support of the officials. In the end, Qin Shi Huang overruled everyone's objections and named her Crown Princess. Yet the road ahead was still full of hardships. How could this four-year-old girl use the System and modern knowledge to survive in a palace teeming with danger? Could she rewrite history and help Great Qin endure for ten thousand years? Could she help Qin Shi Huang realize his dream of living as long as the heavens? Could she make the whole world speak Qin? (This is my first novel, so the writing may not be very rigorous. Please don't overanalyze it.)