DC on Camilla?

I would only put DC on her if you want her to tank mages and destroy them on retaliation. Otherwise, it is not necessary for her. I personally have Deathblow, Renewal, and Hone Fliers on her.

I've got a +10 Camilla with the same IVs. She works very well with Fury & Renewal. She's a good candidate for DC with Iote's Shiled especially if L! Lucina becomes more present in the meta. With her weapon effect and support, she can bait and tank Lucina. She's really versatile with her weapon and all so you might as well try the two builds and see what works best for you in different situations.

Couple of points:
- guidance is a dubious choice in my books because her axe buffs fliers and cavalry, precisely the two classes for whom guidance does - and I do not exaggerate, sadly - nothing
- I think +atk is more for an offensive build. She one-rounds most of the kind of things I'd want her to face with a moonbow even without +atk, so I prefer +spd or even a boon in a defensive stat (but then it's not clear which stat she should sacrifice).
- If you want to use DC, I suggest do it on a flier team and use Iote's Shield. She's one of the better fliers for this combo; I'd say her main competitor is flying Tiki. You maximize the utility you get out of her skills this way. If she's only going to tank mages then in arena I think you're better with Felicia, who will really stick it to any mages (including reds, maybe except W.Tharja, who Camilla will also have a pretty bad time with) and ploy or even pick off some res-dumpers if the enemy doesn't field mages. In PvE I tend to like Felicia less even though I have her at +6 because they just give the units stupidly 40%-60% too much HP for no reason and Felicia's lower atk stat and lack of triangle advantage actually finds that quite hard to deal with. I don't even necessarily win against mages without Plate+eff and one-round glacies.
- since you seem to be going for a support build, I'd focus more on winning the matchups where she has the greatest advantage and letting teammates deal with the rest. If you're not using chill spd, QR can be a good option for dealing with super-fast units because she only needs to figure out how to block their double, and blocking doubles is much easier than finding them when your competition merges their spd into the upper 40s.