you should check orc camp in the north and recapture human prisoner inside orc camp because they are trying to escape.
there is 3 result for helayna, escape , rowan slave, rowan personal knight.
there is 2 option when you capture the fort,
take helayna as your prize and she is belong to rowan.
or
let the twin have her.
letting the twin have her will cause her to escape no matter what (alexa will help her escape in case rowan doesn't help)
taking helayna as yours will give another route to train her as knight or the other things.