Tā yǎn lǐ róu bude cǎocìr, yìdiǎn xiǎoshì jiù bù gāoxìng.
She can't tolerate even the smallest thing - the least little issue and she's upset.
Tips
memory
A 草刺 is the tiny burr or prickle on a stalk of grass - barely visible, but irritating if it gets in your eye. Perfect image for something small that shouldn't matter.