Peace be upon you.
Grand Ayatollah Sayyid Sistani (may Allah protect him):
It is required for a girl who is a virgin to have the consent of her father or paternal grandfather, unless she is independent in her affairs and has control over her own matters. It is strongly recommended to obtain the consent of one of them if she is independent. Without permission, the contract is considered provisional and its validity depends on the approval of the guardian, which is obligatory in the case of independence and a fatwa in other cases. The girl remains a stranger to the man until the father or grandfather gives their consent.
Grand Ayatollah Sayyid Khamenei (may Allah protect him):
It is strongly recommended to seek permission from her father or paternal grandfather, and the contract is not valid without the permission of one of them.
Without permission, the contract is provisional and its validity depends on the approval of the guardian, which is obligatory, and the girl remains a stranger to the man until the father or grandfather gives their consent.
May you be successful in all good.