The CNN article got comments from two other people present.
A resident:
Dr. Hisham Dweikat, a resident of Beita who took part in the demonstration, told CNN that as the protest was wrapping up, the Israeli military started firing tear gas towards the crowd.
“As people were running away, live fire was shot and a soldier fired directly at the protesters, hitting the American activist in the head from behind and falling to the ground,” he said.
An American activist:
Eygi was crouched behind a dumpster at the bottom of a hill when gunfire began, Vivi Chen, an American activist who was at the demonstration and who volunteers for Faza’a – another pro-Palestinian group which works in partnership with ISM – told CNN. Chen confirmed Eygi was there with ISM.
“We were all at the bottom of the hill and the Israeli army was at the top,” Chen said. “There were two volunteers sitting behind a dumpster and they fired one shot at the dumpster. It hit a metal plane. And then there was another shot and they shot – they shot her in the head.”
...
“They are one of the most advanced armies in the world,” Chen said. “They have weapons from America. It is not an accident that they hit her in the head. That was on purpose. It’s not that they shot a hundred shots at the same time, and she was hit with one. We were all standing still, not moving. Just standing there, and they shot her through the head.”
If you just mean the part about advanced weapons from America then I agree with you, it's nonsense, obviously an accurate rifle can be manufactured anywhere.
The not an accident part has a decent argument. Considering that only a few shots were fired, one hit the dumpster she was hiding behind and one hit her in the head, it seems unlikely it was accidental.