Tā píngjiè wánqiáng de yìzhì, zuìzhōng fǎnbài-wéishèng.
With sheer willpower, she ultimately turned the tables and won.
Tips
usage
反败为胜 is commonly used in sports commentary, business narratives, and stories of overcoming adversity. It always implies a dramatic reversal - things looked bad, then turned around. The similar phrase 转败为胜 is interchangeable.