I made a few edits, like adding wikilinks and a "References" section. The citations were not really formatted, so I formatted the first one in a template as an example and then started templates for the other sources so that the accessdate fields that need to be completed are identified. If you have more than one use of the same source, you can name the first use - with the full citation information with a name, like  ..... and each subsequent use just needs a tag like .

Generally, I wouldn't use a gallery as a source of information, because they have a biased stance, but it may be that this was considered ok for this course. 

It would be nice to see the segue between her being born in England and being considered a Canadian - I'm guessing that her family moved to Canada when she was young, perhaps with the end of World War II. Perhaps one of her parents was Canadian?

I totally agree about the exhibitions information, it overwhelms the article. I think it would make sense to roll the information into 2-6 sentences, such naming the countries where she's had her works exhibited and notable and/or oft-used venues. (talk)