Well, not literally, though she was apparently a member of both the now-tiny Bloc Quebecois, and the little communist separatist party, Quebec Solidaire.
Is this a high revelation? Well, there's the fact that she never mentioned it before; that's somewhat of an issue, given the controversies before, because why would you keep it under wraps especially when you know the media is hungry for it? No matter what random reasons were given. There's also the fact that she was a member of Quebec Solidaire up until... today.
Turmel has said she is a stringent federalist, however, one has to really wonder whether that's true anymore. I did, because hey, the BQ and QS do have other goals. But to become a member of both these parties, rather than just turning your union to endorse them in a sort of half-hearted manner.... that indicates commitment. But commitment to what?
However, in the grand scheme of things, it's nothing very new to any of the federal parties. Look at the tool that was Jean Lapierre and the current one Denis Lebel to see proof of how much the "temporary ad hoc rainbow coalition" permeates politics in Quebec. It's a bit of a crock, really.
That being said, Turmel would not last long in the permanent leader's chair, that's for sure. She'd be eaten alive by the Conservative ads.