Forcing "curly" apostrophes in Twentyeleven

I’m building a site (twentyeleven child theme) for a client in collaboration with a designer who normally works in print, and she really wants to use curly right quotes/apostrophes (as in ’ – ’ ) throughout the site, but no matter the context (in arbitrary HTML, in posts, etc.) my site is actually producing straight quotes (as in ' – ').

I’ve seen some threads about people using twentyten having the opposite problem back when that was new (curly right quotes/apostrophes in place of straight quotes), so I’m kind of wondering if possibly the fix went too far…

In any case does anyone have any ideas about how to work around this so I can make my typography-focused designer happy?

Thank you!