How could she walk out on her kids?

她怎么能遗弃自己的孩子呢？

《牛津词典》

It is hard to negotiate with a fellow lawmaker if the next minute you walk out on the steps and call [him] a weasel.

如果你刚一走出楼梯就称他为黄鼠狼（双关语：狡猾的人），那你很难跟立法者同事进行谈判。

youdao

Someone might walk out on a stage and say, "In fair Verona where we lay our scene!" and then tell all about the feuding families of Romeo and Juliet.

可能会有人走到舞台上，说：“在美丽的维罗纳，我们的故事在这里发生！”，然后讲述关于罗密欧与朱丽叶两家不和的所有故事。

youdao

He asks her out on a date. She is so happy that she may walk around for days with stars in her eyes.

VOA: special.2009.09.06

You can't just walk out on the results of your own hankerings.

你不能只想着你的渴望就能有结果。

耶鲁公开课 - 1945年后的美国小说课程节选

French President Nicholas Sarkozy even told an interviewer that he might walk out of the summit, if nations fail to agree on stricter regulation of global financial markets.

VOA: standard.2009.04.01

Rivera should walk out on his own terms, not because his knee was torn to shreds.

WSJ: Mariano Rivera's Torn ACL Puts Yankee Closer's Career in Doubt

Say to yourself, I can walk out on this deal anytime I want.

FORBES: 3 More Reasons Men Out Earn Women

Drivers will walk out on 17 January after talks between the Unite union and the government broke down on Thursday.

BBC: Isle of Man buses