Jellyfish has some kind of guided-psi-weapon in this little cockpit - check your inventory! I find this very useful for underwater missions.
Tested it a bit, had a few problems with it. Firstly, it seems the first few shots get stopped by the wall the girl resides in. It seemed that I have to shoot through the wall (a small vent in front of the girl) in order to make subsequent shots to actual targets. Sometimes it took 3 shots to destroy the vent.
Secondly, the damage was really abysmal (tested it shooting my own units). Maybe if the girl using it is strong on VP it will be more effective.
At that case though, I am pretty sure she can use stronger VP weapons and be mobile.