IMO she resented her parents for sending her to this school. Maybe resented her parents for other things as well. IMO she didn't target particular students or staff, she targeted her parents and she killed these 6 poor, innocent victims to hurt her parents.
110% agree with you,
@Tillicum. Seems that there are
many students who bear a deep...resentment (often comes out in the elementary classrooms where I teach as plain, old-fashioned
anger and unexpected
verbal outbursts) toward their parents! I guess...once young people with "anger issues" have more years (and a greater likelihood of others not wanting to be around them, or to include them in their groups of school friends), then...it seems now that such anger has been morphing into outright
violence, generally as we have been seeing in the last 5-10 years here in the States. It has been rare indeed to hear one of these students with "anger issues" speak of his/her anger, but...every now and then (once in a "blue moon"?), several different students over the years have privately told me, "I'm so
angry!" When I've asked them, "So...why do you feel this way, and have this anger? Any ideas?" Almost inevitably the response is toward some adult at home -- could be toward a mom, dad, or even toward a grandparent with whom they live. When I've asked them what ideas they might have for dealing with their anger (and true, this is lower elementary school, so the conversations with middle or high schoolers would be a world of difference), they often have responded (yes,
angrily 
) by saying, "I suppose I should probably try to...[get this!]
talk it out, but..." (here they often give excuses, usually directed toward the home authority figure: "He/She won't let me do
x", or "They won't let me stay up late at night", etc.)
Just amazing to *me*, really, that many kids so young
already have it "wired" into them (thank you, school guidance counselors and parents who emphasize
talking out a problem) that
talking/listening is one of their
best solutions (rather than saying/doing mean or unkind things to their classmates).
I am nooo "counselor" (not a professional one, anyway), but it does seem (MOO here) that these young students who have opened up to me in the past have already figured out a "life key": a way to "work through" difficult life situations. And I do wonder if those who have been the perpetrators of these horrible crimes (such as what took place yesterday morning in Nashville) have decided to just "act", rather than to "talk it out"... (Am making NO excuses for those who took innocent lives; am simply wondering out-loud here how we as adults can help some of the young people in our individual "worlds" by asking them some open-ended questions, and by...listening...)