Marriage without the Wallie knowing about it.
If the couple get married without the father knowing, and later after father knowing and then approves of it his approval is void (not accepted according to the Shariah) because the Prophet ﷺ said: فنكاحها باطل باطل باطل . So in this case the contract is void (fiskh) and must renew the contract with the presence of the Walli, and she should give him Mahr Al Mithli. If they did not consume the marriage then they must be split up without any mahr. If they wish to marry then they should make a new contract with the presence of the Walli. Ashaffai says: Marriage without a guardian is an automatic separation (fiskh) whether it's before consummation or after it.