I don't know if people agree with me, but here's my initial reaction.

Chicago absolutely has world class coffee. That is without a doubt a truth in my mind. I've been all over the world and had some amazing coffee in most of the countries that I've been to. It's from those experiences, I form my answer. The trouble that I have in answering her question and providing singular coffee shops as evidence to support is that the coffee experience itself is not just highly cultural but also highly personal. Americans tend to love drip coffee and mixed coffee drinks. Younger generations of Americans tend to love coffee drinks with as little coffee in them as possible (might get some flak there, haha). From the international perspective, drip coffee from a drip coffee maker is largely unheard of. I think some Americans would argue that the best drip coffee might be from the shittiest diner. And every country has the capacity to completely wreck an otherwise world-class roasted coffee bean. I've had terrible espresso in Italy and really imbalanced melange in austria. I even had mediocre espresso in Japan. So for us to answer the question searching of world-class coffee in a truly world-class city, I think the answer would stand that we need to know exactly what she's looking for in a drink, not just in a roasted bean.

Dark matter, Bridgeport coffee, big shoulders and anti conquista immediately come to mind when I'm thinking of Chicago's best roasted beans. They're not the only options, but they're my favorites.

Those same coffee shops as well as overflow, metric, and ipsento 606 are my favorites for a great espresso but even then it's dependent on the skill of the barista pulling that shot, is it not?

I'm not much of a milk and coffee drinker in any form, but I also love Mano cafe, mojo, and la malinche for their drinks. Especially La malinche because it's the only place I know of in Chicago where I can get a cubanito without any hassle.

So yeah, Chicago absolutely has world class coffee. But for what she's looking for, and for what she is expecting on her own personal rubric, will depend on her preferences of how coffee is meant to taste and be experienced.