My guess as to why it's all coming out "now" is because she was always portrayed as "happy Marcia Brady" and she didn't really want the public to know her personal problems until it got so bad that she had to involve Dr. Pihl. From what I gather from other posters this has only been going on since her mom passed away in 2004. I could be totally wrong.
I'm thinking the article(s) you read might have been printed before she went public and that could be why they made it seem like there was nothing wrong in her life. Seeing as I don't know the exact date of the article, I could be wrong about that too, that's just my assumption. I am a fan of The Brady Bunch as well, however, by the time I came along, there were just re-runs. I hope she gets the outcome she desires and deserves.