L.S.
Hi K. - I wish I had seen your posting earlier, since I have just the person for you. My dear friend, Sharon Ang, who is 30 and from Malaysia but has attended school in the U.S., is fluent in both Chinese and English. She teaches private Chinese lessons to kids and adults at the location of their choice. Most of her students have the lessons in their own homes, but one little girl (who I think was 4 when Sharon started tutoring her a couple of years ago) has hers at McDonald's in Chicago while the mom sits at a nearby table working. Sharon drives all over Chicagoland to give Chinese lessons, so I'm sure the Lemont library would be no problem. Her cell phone number is ###-###-####. You won't meet a sweeter, kinder, more patient person than Sharon.
Good luck,
L.