I've read all that. According to the folks that study the apochrypal books, this one was dated in the 4th century AD, a little late for her to write anything. Also, it it has been surmised that there were lots of extra-Biblical books written with the names of famous Biblical characters as Gospel of... It was designed to lend credibility to them, not that the person actually wrote them. Now you'll say that this is circular reasoning, but these books had material that was contradictory to the 66 books of the accepted canon and were thus rejected. Also, they were deemed to lack the authority as well as contained errors. Basically, they were saying that they were poorly written and lacking in divine inspiration. Can all this be proved? No. But this is what was decided by the Rabbis at the Council of Jammnia, for the Old Testament and the Christians for the New Testament.
I have read some of the apochryphal books on my own to see what they were all about. My own perception was that some of them seemed to fill in or explain what was in the canonical books. For instance, the Book of Esther NEVER mentions God, though it was implied throughout. Well, there was a book attributed to Mordechai, her Uncle, that is replete with God this and God that. Some of these books relate nice stories, like Bel and the dragon or Susanna - but the Jewish rabbis said they were lacking in divine inspiration or had errant theology.