She got married in the mosque without her parents’ knowledge

Is secret nikkah is permissible? My friend went to mosque secretly from her parents and had a nikkah but there was only one witness for the nikkah. Is the nikkah valid. Please advise may god bless you. Thank you.

Praise be to Allah, and blessings and peace be upon the Messenger of Allah:

There has to be a walee (guardian) and two witnesses to any marriage, because of the hadeeth, “There is no marriage except with a walee” and “Any woman who gets married without the knowledge of her walee, her marriage is invalid.” Therefore this marriage contract must be renewed, if her walee agrees to that, in the presence of two suitable witnesses. See Question #2127.

And Allaah knows best.