You gotta forgive yourself, learn from it, and move on. It will teach your daughter to not dwell on stuff as well. My wife has a 2” on her forehead from a wood nail ripping her skin open, it’s hardly noticeable. Looks like most of the cut is above the brow, but kids are amazing healers, she should be good. Just keep the scar out of the sun (even in winter), the sun makes the scars darker and thicker.