I had an employee a few years back that was in this situation with her significant other - here's what we did:
Good info above. Illinois has VESSA - which is specifically targeted to assist victims of domestic violence. Also...give the person
1-800-799-SAFE, it is the national domestic abuse hotline.
There's good info there for HR professionals as well.
All of the above are good suggestions. We had a situation like this at work and I actually would walk the employee to the Subway each day after work until she felt comfortable.
I agree with a lot of the other posters here.
Also check your state regs, they may have laws on the books that require time off. FL just implemented a law to that effect.
Some states also allow leave for victims of domestic violence, to get court orders of protection, to go to court for related reasons, or to seek counseling or medical care. Check with your state law to see if you are required to give leave for any of those purposes.