不让她生气用英语可以说 "don't make her angry" 或 "don't upset her"。这两个表达都表示不要让对方变得生气或不高兴。

例句：

"Please don't make her angry. She's already having a bad day."
"I know you're upset, but please don't upset her too. Let's try to keep the peace."

中文翻译：

"请不要让她生气。她今天已经过得很糟糕了。"
"我知道你很不高兴，但是请不要让她也不高兴。我们要尽量保持和平。"

来源：这两个表达都源自英语中的动词 "make" 和 "upset"。"Make" 表示"使变成"，"upset" 表示"使不安、不高兴"。因此，"don't make her angry" 和 "don't upset her" 就是在说，不要让对方变得生气或不高兴。