Maybe this quote wasn't bad editing, but selective editing to avoid naming Muslims near the start of the article.
This statement is a flat out lie. There are no clashes between Christians and Coptic Christians. Either she is not being truthful or the author of the article is wrong. Or maybe it is that the media can just no longer bring themselves to report Muslims as the troublemakers.
I was in Cairo a year 1/2 ago with a Coptic Christian guide. Essentially all of the Christians in Egypt are Coptic Christians.