Yes, and because she's no longer living, her profile can be public, unlike Michael Snow's which has to be unlisted according to WikiTree's living people policy. I've listed the link to the policy on your Michael Snow question. Confusing, I know, given Wikipedia has a different policy, but one we're all still getting used to!
I love Joyce Wieland's work and will happily add her to our list of Ontario artists. I'll add the sticker, too, if you like. If you don't like it, it's easily removed.
Thanks again for your suggestions, Anna.