I'm a little disturbed at the idea that "dedicated mother" automatically means "quit your job and don't have a career."
Don't any of you know any women with careers who also happen to love their kids very much?
I think Fleur would probably stay home when her children are very young. (What kind of maternity leave is normal in the wizarding world, I wonder?) But I also don't see her as necessarily the sort of woman who'd be happy being a stay-at-home mom.
I think she's intelligent and ambitious, and not so self-sacrificing that she'd put all her ambitions aside just to devote herself entirely to her children. She has a huge extended family, after all, so childcare shouldn't really be a problem.