All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
No doubt this marriage is invalid because it lacks two obligatory conditions:
First: The Wali (guardian).
Second: Two trustworthy witnesses.
In a sound Hadeeth, the Prophet said: “No marriage can take place without the Wali and two trustworthy witnesses.” [Ahmad and Al-Bayhaqi]
So, this marriage should be revoked. It cannot be resumed without two witnesses and the Wali (guardian) of the woman.
For more benefit on a woman’s marriage without guardian, please refer to Fataawa 92758, 85057, 226429, 132754, 269080, and 81777.
Allah knows best.