NY Laegjarn theoring

So I'm looking forward to our upcoming TT reward NY Laegjarn and I certainly plan on using her. The only "issue" I'm seeing is her base kit. The kit itself isn't bad, as Chill Res is certainly a welcome free skill, the problem is Chill Res can only benefit her magic/dragon teammates. Meaning she'll likely want to replace it.

Now if we look at her stats 38/46(with 14 mt weapon)/35/35/17, is an interesting spread for a free lance cav.

In fact her stats basically make her a Cavalier version of Nephenee, Laegjarn has -3 res but +1 hp, atk, and def compared to a neutral Neph.

So she could run potentially an offensive spread or even defensive one.

I'm guessing offensively would likely opt for her default weapon, Firesweep, or Slaying Lance. With A-slots being pretty standard of Fury, LnD, SS, a Brazen. And a B-slot leaning toward Desperation, a Breaker, or Chill Def/Spd (if Firesweep).

The uncertainty for me is what would she opt toward for a defensive set.

Weapon: Tannenboom, Slaying, default?
A-slot: Fury, Bond, Brazen, DC (expensive as much as I like her I'd rather not myself)?
B-slot: Breaker, Chill Atk, QR?

Is there anything I may be overlooking as far as skills/weapon for either offense or defense set?

Part of this is me being torn on if I should use my W!Robin (who I don't plan to use) to fodder to Laegjarn for Tanneboom and Brazen (by using a 4* Linus) or for Armor March (to B!Hector or W!Cecilia).