Gf stood infront if the abandoned looking church...she saw...Korra..

Alt Gabriel: "Isn't she wonderful my dear?.."

This wasn't Korra...Gf saw Korra's corpse behind this supposed "Korra" in front of her. That think was not Korra..

Gf: "What did you do..."

Gf was on the verge of tears, this broke her clearly..