Is it permissible to make up the two rak'ahs of a vow that were missed before Maghrib prayer after finishing the prayer?

What the questioner did by repeating the two rak'ahs is correct, based on the Prophet's (peace be upon him) saying: "Whoever vows to obey Allah, let him obey Him." She is obligated to offer an expiation for an oath (kaffarat yameen) because the time for fulfilling the vow has passed. We would like to draw attention to two points: The first is that if this vow coincides with a time of disliking (karaha), she is not obligated to fulfill it. The second is that congregational prayer is not obligatory for her. Therefore, in the future, she must prioritize fulfilling her vow over congregational prayer.