Your party can save Mayrina from a dreadful situation in Act 1 of Baldur's Gate 3. While she may not be happy about it at the time, she will come around by Act 3 when you come to her rescue one more time. This is the last act of the campaign, where you will reach Rivington and, finally, the grand city of Baldur's Gate. Many of the consequences of your early choices will finally pay off in rewards or new enemies.