A candle is usually lit, privately, in someone's memory. That would be absolutely appropriate.
Public displays of remembrance for a child none of us knew on the day she met an awful fate is, crass, there is no other word for it.
I am sure there are those on this very forum who will try to dress it up that you are somehow deficient for holding that view. I ain't one of them.
The best thing to do with this thread is can it and let people silently remember, pray for her soul, her return or whatever else they wish to do as a mark of resepct but do it in their own way privately.
This is no place for outpourings of grief real or contrived.
It will only degenerate into the usual mindless "my grief is more profound than yours" routine.
In fact the degeneration along those lines started a few posts ago.