Does Gwynn Die in the Outpost?

Talon offers to take the Black Kinj into herself but she already has the Asterkinj so she cannot take it. So Gwynn chooses to make the ultimate sacrifice and takes the Black Kinj into herself, essentially sentencing herself to death.

Is Gwen really the queen in the Outpost?

She was adopted by Cornelius Calkussar and kept safe in a remote Outpost in the corner of the realm Rosmund assumed the identity of Calkussar's daughter, Gwynn, and hid her true identity as Queen of the realms.

Did Garret die in the Outpost?

Because Gwynn does, she takes his hand and mounts his horse and they ride off with everyone watching them. Once out of the Outpost, she remarks that she's happy that Garret's alive.