User blog comment:LegerPrime/Mother's Key/@comment-5894890-20151219190710

Highly doubt it. First of all the age thing, at this time Layla would be 44. Brandish doesn't even look 30. Secondly, Zeref refers to Layla and Anna differently compared to taking and referring to Brandish. Thirdly, Brandish has some sort of hate for Layla... so I don't think she would hate on herself, and try to destroy her hometown etc, that would seem poorly written anyways. Mashima has written her in a way, in which, she is a character of her own; a character with unique traits- lazy, gothic etc, i don't think he will change that. Fourthly, her personality completely contrasts from what we know of Layla. As you said, the eclipse arc had this, but that only affected the spirits. Lastly, to gain extreme mastery over a completely different type of magic seems unlikely.