https://www.yahoo.com/gma/parkland-mom-lost-daughter-wins-seat-county-school-093500659--abc-news-topstories.html

She says she wants to make a change.  So like what?

Cruz was deemed mentally fit to be in normal classes (1 could argue that he wasn't because his grades dropped and he requested to be back in SPED)
FBI and police knew about him (but no felony laws broken)
Came back as a former student
Armed guard on site refused to act

I guess maybe have all doors locked from the outside?  But how will emergency responders get in if needed?

Seems like she won the seat solely on emotion.

MSD did bring in 25 unarmed guards for the new school year. 

Seems like great news to me. It's not like she can pass anti-gun laws. She can only help to improve school security and discipline, which we badly need.

What can she do? That's besides the point, she'll do whatever she is able to. If nothing, that's fine.

What could be done? Get SPED students back out of normal classes, it's kind of a stupid movement anyway. Although I also think too many students are classified as SPED and I don't know where this individual belonged. The whole situation with SPED is messed up in America because the fields of psychology and education are  bullshit. They have kids in the normal classes who can't even speak and sit there staring at the ceiling with drool coming out of their mouth, and they have kids classified as SPED who are totally normal and even above average intelligence.

Get better security guards. Armed guard on site is good but you can always bring in more armed guards or train them better. Maybe some will act.

Deal with problem students earlier and more aggressively. Either this kid or those who instigated him (I don't know details so I'm not taking a side) should have been expelled long before any massacre occurred. This is a school discipline issue and students in general should be expelled much more easily in America.