Gamer, I do hope you can satisfy the GM's and get in. While you're doing some thinking about that, I have some comments about your character and specifically the engineering you have written that she has done. Of course, these are mostly rather trivial and technical details, but such details would probably help more-realistically shape the character of highly-skilled mechanic.

One thing I noticed was time. She's only 22 years of age, yet she's already created highly advanced pieces of military machinery? Her apprenticeship started at 16. That would last at least 2 years, or probably 4 because this core-mechanics is a complex thing. That leaves 2-4 years between exiting her education/apprenticeship and the present day. She and her team must work fast, then. Something like a weapons-grade laser would take a long time to make practical, as you'd be hard pressed to find a practical way to cool it that doesn't limit it to a few shots (I imagine that some cold cores, which I presume exist, would either have to be very big or replaced every couple of shots, neither of which are good options). Something like a blade made of whizzing dust held together by kinetic cores would take a long time to make it work at all, and even longer to be practical enough to be useful. And this being military contracts you wouldn't get away with jury-rigging something together, so R&D for a single invention would take time.

That's not saying Ewera couldn't have done all that in the given time. She'd just have to have been working very, very hard, or she's some kind of prodigy. Perhaps the shortage of time explains why her Hallowback is so unreliable.

On a scientific note, electricity doesn't work in such a way that you can specify both the voltage and amperage for a source of electricity. You can create a definite voltage, but amperage is determined by the resistance of the path it must take. Do also note that it takes 10,000 V to arc across 1cm of dry air. A 1200V lightning bolt is nothing. By comparison table-top Van de Graaf generators can produce a hundred thousand volts. Yes, if you held a wire with a 1200V electric current running through it you'd probably die, but if you attempted to fire that at someone you might make their hair stand on end if you're lucky. Your voltage at the target, which is what you would care about, would vary by distance and atmospheric conditions, meaning saying 'it has 300V at this mode and 1200V at this mode' is hard to support. Perhaps omitting the voltages and currents of your lightning turret would avoid this issue, meaning you can say 'it just works' and leave it at that.

But do not fret. Such details are not vitally important. Stuff like grammar and power balance are much more important, as the GMs above have mentioned, so put fretting into those if need be. I just wish to help you construct a more realistic character by putting out a few points of consideration.