P_Kreia1hBB is, as both the model name and "gimped" description suggest, 1-handed. It's also the regular party Kreia (post Harbinger hand-chop), not the Dark Side "evil" Kreia. The "stunt" Kreia is the one you meet in the morgue, and has the animations for getting off the bed.
The DS Kreia you confront on Malachor is Party_NPC_Kreia_Evil, using model P_KreiaEvilBB. This is of course 1-handed, and is the model you see in your video. The 2-handed evil Kreia model is P_KreiaEvil02, but that has no appearance.2da entry. This is the model that has the "Kreia's Fall" cutscene animations. I had a look at the dialogue file for that scene (kreiaend.dlg) and it references P_KreiaEvil02 as the stunt model, which explains how the 1-handed Kreia received the animations in your video. The script that is fired by that dialogue (a_kreiaend) calls one of two Kriea UTCs (which share the same tag, "KreiaEvil"), both of which point to the 1-handed evil Kreia appearance ID (naturally, since the only other evil appearance is the one with no hands - as mentioned, there is no 2-handed evil Kreia appearance).
Given the issue with the hood lining, as pointed out by Hassat Hunter here, the logical solution is a revised 2-handed model renamed to override the 1-handed model. This would simply require dumping the files in your Override folder long enough to cap the scene, with no other changes. I'll whip one up and PM you about it.
Excellent reskin work! There is one small problem I noticed though. When you are far away from Mission, you can notice a black line down her face. Is there any way to correct this seam?