Half the population is female and she was replacing another female, so...
A large % of Canadians are overweight while others are skinny. Some are short, some really tall. Some black, some white, some aboriginal, some asian etc. Some have vaginas, some have penises, some have both, some have neither. Some come from rich families, some from poor ones. Some have physical disabilities, some mental disabilities, some psychological disabilities, some 100% healthy. Some are straight, some gay, some bi, some trans, some gender neutral assexual. Some live in the East, some in west, some up north, some Quebec. Some born in Canada, some not. Some rich immigrants, some poor refugees. Some Christian, Muslim, Hindu, atheist etc. Some from big cities, some from small towns. Some grew up with 2 parents, some no parents. Some good-looking, some ugly. Some single, some married, some have kids, some have none. Some are old, some are young, some middle-aged. I could keep going for awhile...
We're all very different as per above, but we're all Canadians. You aren't going to get a group of Justices that are representative of Canada. "My group isn't represented"...OUTRAGE!!! This is a stupid social engineering project based on completely arbitrary subjective categories picked out of the air that fulfills our moral do-goodery for "diversity". What offends me is that you can line up 9 white dudes and they're likely very diverse in the categories I outlined above compared to if you're making 1 or 2 of the above categories "person of colour" or "female". To say white men are any kind of monolithic group is ridiculous, racist, sexist & stereotyping nuttery. A 40 year old white dude from a rich family likely has much more in common with the female visible minorities that grew up in his same neighbourhood & are similar age than another white dude who's pushing 70, lived in a poor small town all his life on the other side of the country with his gay lover & been deaf since birth.
Regional/provincial requirements may be fine IMO because at least that has political (and constitutional?) considerations re: federalism, similar to the Senate. Stop drawing random lines and just go with the best damned resume.
As for bilingualism, that’s been a part of the Canadian reality since before there was a Canadian reality. It matters.
Don't have a problem with the bilingualism since that's part of the job in a legally bilingual country.