Jekka:
I’m no expert in the early Christian writings so my answer to your question might be incomplete.
From what I’ve read, there are a number of books that were left out of the New Testament. Some of them are much more famous than the Book of Mary Magdalene, such as the Gospels of Thomas, Peter and James. Some of these Gospels, particularly the Gospel of Thomas, are widely used by Gnostic religions.
Historically, the Fathers of the Church only relied on the four Gospels that made it to the New Testament because they believed those were the ones written by people who heard the Word directly from people who had direct contact with Jesus. That is the case of the Gospels of Luke, Matthew and Mark. People believe the Gospel of John was written by the beloved Apostle, but scholars have their doubts.
At the Nicene Council in the 4th Century, the Bishops got together to decide which books were, going forward, going to be included in the New Testament. They discarded all except the four we know. The reason was because they believed most of them were forgeries. The only true, divinely inspired Gospels are the four Gospels we know (that’s what the Nicene Counsel decreed). From what I’ve heard, most of the New Testament Apocrypha has been proved to be forgeries even by modern scholars. Most scholars agree that those books were written in the second half of the 2nd Century and in the 3rd Century. The Gospels of Mark, Luke and Matthew are said to be written between 60 and 70AD, while the Gospel of John is believed to be written between 80 and 90 AD.
If by Apocrypha you are referring to the books included in the Greek version of the Old Testament, but not included in the Hebrew Bible, then the Catholic Bible includes most of it. It’s the Protestant Bibles which not include the Apocrypha (except the King James version)