Quick [Overview]

This is a fairly simple [Gyre] nuke build. your main source of damage is coming from Rotorswell and for your primary I recommend using Proboscis Cernos [Amprex] is another solid choice this is to replace her 1 of keeping electric procs applied to enemies whilst also giving you some lovely viral for more damage

the game plan

Now this is fairly simple you have the option of priming targets with electric and viral or you just go straight into murder mode. group enemies with Coil Horizon (this can be detonated mid roll by recasting) use terrify to strip armour then cast Rotorswell and Cathode Grace to watch enemies fall over once you have cleared the first group move on to the next then to the next so on so forth now you'll need to keep Rotorswell active but other then that Cathode Grace will stay active as long as you're killing stuff

different options

Aura: I'd only swap this for Brief respite or Growing power
Arcanes: first off energize seeing with how much this Ballerina loves to eat energy this is a very very welcome arcane but can be swap if you give her 2 amber Archon shards with energy orb effectiveness and i would swap energize or either molt augmented or arcane Aegis this is the same with arcane avenger but with the crit chance buff [Gyre] has with Cathode Grace combined with Avenger it is just a fun arcane to combine with her
Mods: the only mod I would personally swap is [Streamline] with [Natural Talent] but this is only if you cant or don't want to add 2 Amber shards with casting speed onto her. If no [Primed Flow] use normal [Flow] and if you don't have prime [Continuity] use normal but farm the plat to buy it 30% vs 55% is massive you can also swap [Streamline] for [Creeping Terrify] but I don't find it necessary cause the CC provided by electric procs and the grouping of coil horizon means that they don't go very far away from you and if you want you can also add another forma to slap on [Umbral Intensify]