I still think it does too much damage considering it's a 100 health 5th council that can escape whenever she wants. Again, compare it to the other heroes that one shot, as stated above.
If she COULDN'T escape then the argument for swarming her would make sense, but it doesn't, she can just run away. And running away DOES solve a lot of issues as antag, you stay alive and they have to exert effort concentrating on you rather than the mission. Even if they DIDN'T kill you but you are harassing them and not dying this allows more adds to spawn, more time to tick, more phases for the boss to occur, more damage to escort, etc... I mean, she can do this anyways, but the added threat of a one hit kill is a bit much for someone outside of the Alien (worry "locals") faction.
Again, keep the damage the same, just make Ginebra antags EARN the damage by removing the red indicator, keep the blue line, remove the red light up. Otherwise nerf the damage if you're going to keep the red indicator.
EDIT: It's important to note that you CANNOT take cover from this weapon. And that even being out in the open is a death sentence, she just has to shoot the ground in front of you. Other characters that can one shot you have the option of taking cover, or just killing them since they only have 60 health and very little escape.
I've been on the receiving end of an antag with a Schleuder and there felt like there was VERY little we could do, we were at the complete mercy of the antag. Unless we had a very skilled sniper of another Gin with the Schleuder.