Sure, but Incendiary Ammo deals more damage and FE deal more damage than tech bursts.
Furthermore, the Arc Pistol (which is the weapon the OP is using) is capable of killing most stuff with a single shot anyway which makes the priming argument kinda silly (it basically only applies to boss units in this particular case).
I'm not arguing that Disruptor Ammo is a bad choice for the FQE. All I am saying is that when you give her the Arc Pistol most of the utility provided by DA isn't going to make much of a difference. She's likely going to get more bang for her bucks with Incendiary b/c it deals more damage, to armor in particular.
It depends a lot on passive spec. If I am making blanket rules, there are going to be about 2 or 3 more humanoids you can one-shot with the DA4 setup over AP4 or IA4 on Platinum, dependent on 5 v 6 ranks and if you took power damage or headshots at 5. If you don't have at least 5 in passive, don't take Headshots at 5, and you don't plan to run any weapon buff gear, it may be better to go with IA or AP since DA starts to lose mooks that you can one-shot.
Whether or not a certain combo does more damage mostly depends on what protection it is going up against. And since the Arc one-shots too many units, I wouldn't worry about IA v DA from that perspective. I am not sure that FE's actually do more damage, they reduced the base after they made them "easy" combos in the patch. So TB and FE should have similar base ranges, and I don't think the FE DOT ever was fixed to be non-zero.
Anyway it is all up to preference, I don't think there will be a huge difference between DA, IA and AP on her. I might prefer AP for armor though, just for full damage multihits and through cover.