^I have not heard that yet but I also have not looked into much about the holidays other than the basics of what they stand for and how they are celebrated. I don't even remember everything about them yet. I need to read something specifically about the holidays at some point.
It could be possible that is just how a certain Wiccan tradition or coven looks at it. There are various types of Wicca that is why it is not always good to try and generalize some things when talking to people without letting them know it is just part of their tradition or the coven they belong to.
I would think she may have not wanted you to talk about it because it was most likely part of her tradition, coven, or even something personal to her.