She lived from 757 to 817 , and was the wife of Emperor Trisong Detsen ( 740 - c. 798 ) who invited Padmasambhava to Tibet : From the mouth of a lotus was born The swift goddess , heroic liberator Who went forth in human form Amid the snowy mountains of Tibet . From the mouth of a lotus was born The swift goddess , heroic liberator Who went forth in human form Amid the snowy mountains of Tibet .