Stressed

Why stress can be so scary?

If you experienced the similar incident as below, you also will ask the same question.
This incident happened on 19th March 2008.
My colleague, who was doing accounts, suddenly disappeared for a few hours. I was busying with the documentation for shipment sailing on 'good Friday' so didn't notice about her weird behaviour until her sister came to our office to look for her sister. Her sister looked like very worried, kept asking me and my colleagues where is her sister.
"Something is wrong." I guessed.
I took the toilet's key and quickly go to toilet with her sister. Nothing was found after we shouted for around two minutes.
Her sister said my colleague is been stressed until cannot eat and sleep. My goodness, what's happening with my colleague! I was very regret for not having a good talk with my colleague on the day before. She was very quite that day, I should discover on the same day. How stupid me!!~!
Back to 19th March. My colleague came back office at around five o'clock, sitting at her desk and staring at her unfinished job. I can't really remember what her sister and the other colleague of mine talked with her. I just remember they kept persuade her to go home but she did not answer them at all. The same sentences flying in the sky of the office for more than an hour, the quiet one remained.
I took a glance at the clock in front of me, it was 6:30pm. The same sentences still flying.
"I've reached the limit, I can't sit and listen anymore, I must take some actions." - I mumbling.
My colleague was dragged out to the office, by me, no doubt. She went back with no other choices given.
This is the first time she behaves like that, her eyes glazed over, expressionless.
For the one who is reading this post, can you tell me what we can do for her?

FOR YOU, I don't think you still got mood to online, but if you are watching this post, please finish the message below as well.

我不知道会计这个行业给了你多么大的压力，足以让你变成那个样子。
我只能告诉你，不论压力多大，一定会有办法解。
每个人解压的方法都不同。我们不能为了那一点(还是你认为的那么大点)压力，就投降，就让它操控你的思想， 把你搞得不成人型。不要继续钻牛角尖，前面还有一大段路等着你走。好好休息，让自己冷静下来。所有人都很担心你，我想你不会不知道。你忍心让他们为了你难过，掉眼泪？
等哪一天你想找我谈谈时，打个电话给我。