Except it's not.. they don't even particularly look like each other, beyond being young women with long brown hair.
In addition, each of these women have names, and stories - we know who they are. In Boston, Emma MacDonald. At Sandy Hook, Carlee Soto, the sister of one of the girls who was murdered. In Aurora, Amanda Medek, who lost her sister in that shooting. All that was already documented in the Snopes link Farmerman mentioned, at https://www.snopes.com/same-girl-crying-now-oregon/,
because this particular conspiracy-nutter meme has been around for a while. The only new thing about your picture is that they photoshopped in a girl from Parkland, even though she literally doesn't look like the others at all.