Tā bǎ àiqíng lǐxiǎnghuà le, xiànshí ràng tā shīwàng.
She had idealized romance, and reality disappointed her.
Tips
grammar
理想化 is formed by adding 化 (-ize/-ify) to 理想 (ideal). This -化 suffix is very productive in Chinese: 现代化 (to modernize), 系统化 (to systematize), 简单化 (to oversimplify).