Devos probably isn't the best spokesperson for anything...she is not good at wording anything.
Still the basic theory is that this is an issue of murderers / homicidal maniacs. Not one where safety is quite the issue - safety would be say, this:
https://www.youtube.com/watch?v=zw-jTCNZSmY
Warning to viewers: That video contains footage of the accidental discharge of a firearm that results in injury of officer
That is more of an instruction on safety - Trump set up the panel more with the intent to look at the aspect of safety - i.e. how they brought weapons into the school (past detectors) / emergency response / lock down measures etc - not the weapon(s) itself (and their role).
She didn't word it very well but the panel was supposed to assess the situation on the ground(s) / real time / how the issue or shooter could be neutralized etc (like armed guards / campus police etc) not that of a behavioral psychologist as to ascertain the motives behind such events and or the politics of weapon bans and so on.
Her role as ES is to keep those institutes, kids and teachers all safe - a no brainer idea from some would be "ban guns from schools". Guess what, they already are - there is not much farther that she can go with that. Examine age restrictions? Pretty sure that no kid anywhere can wonder around with a gun. That is all taken care of - no need for her to endlessly hash over that.
That is why she needs to look beyond that otherwise the commission is rather a waste of time and money, no?