Originally Posted by
OverThereTooMuch
Another thing to consider is that with a 5hr layover, that's plenty of time to head to another terminal (where you'll find lounges from domestic airlines).
The CLE-ORD flight will come into one of the other terminals, so she could easily hit one of those up as a partner flight. What airlines is she flying?
Double-check it's T5 as well. UA/ANA go out of T1, AA/JAL go out of T3. Asiana, Cathay, and Korean go out of T5.