So then sue her.
If I was a juror I would want to see the following:
1. I want to see a person of similar stature put that gun down a pant leg and in his book bag and go and climb up on the roof.
2. I then want to see this person reassemble the rifle and see how long that takes.
3. I then want to see them take one shot with a scope that hasn't been trued, and see how accurate that is.
4. I then want to see them on the roof dissassemble the rifle and see how long that takes.
5. I want to have camera angles from where the crowd was while he is on the roof assembling, shooting and dissassembling the rifle as well, so I can see if that seems plausible to me.
6. I also want a sharpshooter to take one shot with a similar rifle and same caliber of bullet, hit the neck bone of a ballistic surrogate and see how big the wound is.
It seems to me this reenactment should be part of the trial.