The story is that she moved out a year ago on a boyfriend due to domestic violence.

Criminal backgrounds involving violent crimes, prostitution, and domestic violence and/or involving the possession of weapons or illegal substances are all grounds for denial of an application.An exception may be made for type and or age of offense, please provide details to the Property Manager.Rental Criteria for Pets -Pet policies vary from one homeowner to another.

You deal with problems that arise from it -- domestic violence, noise complaints, drama.

I would consult with a local attorney to discuss the legal ramifications of entering into a lease with a domestic partner, and the ways a lease can be voided under certain facts should they happen.

My wife worked the front lines of domestic violence for quite some time and many of her clients found it "challenging" that they were asked to accept a restraining order against themselves when they filed for one against their abusive ex.Hence why I indicated above that I would need to hear - and be able to corroborate - the explanation for the restraining order.

The thing is, any kind of domestic disturbance situation can pose an element of danger to either tenant and others who get involved (for example, complain about the noise).  

http://chicagoeviction.com/2013/01/refresher-on-ev...Domestic violence/ Elder abuse:http://www.illinoislegalaid.org/index.cfm?

if there is a domestic violence issue with them ( u feel threatened) it might help in some way getting them out. document all your stress and aggravation and of course incidents. be safe! 

So much for DOMESTICATED!

In CA, domestic violence is a valid reason to break a lease, so you may be required to let her out, though it sounds like you're okay with her moving out anyway.