If Minthara Is Knocked Out Within The Goblin Camp During Any Of The Following Scenarios;
Became 'Permanently Hostile' by threatening to kill her through dialogue
Became 'Permanently Hostile' by killing Dror Ragzlin first
Became 'Permanently Hostile' by the goblin war drums being sounded
When the player eventually gets to Moonrise Towers; Minthara will be permanently stuck in the throne room (completely non-interactable and unobtainable).
Just like it was mentioned in this bug report; the reason this happens is because if in ACT I Minthara becomes a 'Permanently Hostile' NPC (which by default become non-interactable), the game will continue to treat her as a non-interactable NPC in ACT II as well and will only fix it if she auto-initiates her rescue dialogue herself (once her captors are dealt with). But in this case the player can't even attempt to rescue her and thus access her rescue dialogue, because she is permanently broken in the throne room.
*As can be seen in this scenario; killing Dror Ragzlin first and then knocking out Minthara will completely break her character in ACT II, because she became 'Permanently Hostile' in ACT I*
*As can be seen if she got flagged as a 'Permanently Hostile' NPC in ACT I - she cannot be interacted with at all in ACT II*