Please note that the first  and third one would literally be breaking international laws by using them, so there'a that. As a GM however, this is what I see:

She has a way of pretty mutch instantly killing anyone who isn't incredibly powerful or who has water based quirks. That's pretty OP, and it's also incredibly useful in the form of BURNING THROUGH METAL. Seriously, just that alone is powerful, but ok.

Then however, she can hide herself from detection by thermal scanner, AKA literally every common form of detection out there, and the one that the military/law enforcement use the most often too.

Lastly, she can fill up almost any container and use it as a remote detonation explosive device. Which burns insanely hot, and can once again slice through metal. Start to see the issues?

[@cloudystar]