I can't help but feel you're leaving out some key details here...
was she perhaps trespassing after walking through broken barriers, past security guards that told people to leave, and through broken windows? was she also warned to stop multiple times while climbing through a broken window to circumvent a barricaded door at the time of being shot?
If those things happened to be true, it would seem that you're attempting to deceive us as readers to make a point in poor faith. Probably no need to do that, right?
You can arrest someone for trespassing without shooting them.