Here's the article regarding the girl in Vietnamese: https://vnexpress.net/thoi-su/mot-nguoi-viet-keu-cuu-co-the-con-gai-chet-trong-container-tai-anh-4002454.html

Short summary: the girl was an exchange worker in Japan for a while, and she applied for a work visa to China a month ago. This is very likely a human trafficking incident.

You can see a photo of her text to her parents sent on October 23 2019. She used Viber (edit: actually looks more like Zalo) a very popular messaging service used in Vietnam (kinda like Whatsapp or Wechat in China). Here's my translation:

"Mom and Dad, I'm sorry"

"Pham thi tra my (her name), (her address in vietnam)"

"My journey abroad has failed."

"Mom"

"Mom and Dad, I love you both so much"

"I'm dying, I can't breathe"

"(Her village and city)"

"Vietnam"

"Mom, I'm sorry mom"

This is a really really sad situation.