Sounds like your daughter was quite traumatized by these incidents. Have you ever tried EFT (emotional freedom techniques?) you can find more about it on EFTUNIVERSE.COM it's a free website.
The point of EFT is to help unblock energy in our body. It's believed that these energy blocks are what in part, "keep us stuck" or traumatized as it were.. It's done by "tapping" on meridian points of the body (just as an acupuncturist) might do, but with EFT not only are you tapping specific meridian points but you are also bringing a selected memory to the forefront. For example, In my case, I get very anxious when in a car and especially when there are cyclists next to it. An EFT practitioner I was seeing had me of course do the obvious, which was run thru any trauma that might have occured in my life and in relation to a car.. So I start reeling off memories (all the while thinking, is this gonna really work) then I get to a memory of when I kicked a ball out into the street and my brother says, I'll get it and bam....... he is hit by a car.. Now, I have had this memory since I was little and although I was sad that my brother was hit, he did survive and with no permanent damage for which I was so thankful. However, as I began to tell the story BAM.... out of the blue, I felt this great sadness.. this shocked me because it was as if the accident was actually happening right then and there in the room.. it was NOT just a distant memory (like I thought it was) anyway, the EFT practitioner then had me tap the specific meridian points and all the while you say different things (the EFT practitioner) will help the person with that..
The point was and is.. we carry trauma within us, whether we know it or not.. and your daughter, despite those things happening at another school, may still "feel" it in her body. EFT , in my opinion can help clear that up.. withouth lengthy talk therapy (which often doesn't work anyway)
after my sessions, we go thru the whole scenario again and after about 3 rounds of tapping, I could finally tell the story about my brother without all that sadness. the memory doesn't fade, but the trauma behind it did..
Apparently, kids respond well to EFT.. therefore, why not look into it. even if just reading about it... they have FREE video downloads and articles to read..
I wish you and your daughter the best..