Extension of my wife's residence permit

I arrived to China on Z (back in October 2014) and my wife on S2 type (back in December 2014). We have both converted our visas to residence permits which will expire on 26th October 2015. The company I work for helped me to renew my working permit and currently renewing my residence permit, however they don't really bother to help with extension of my wife's residence permit. Do you know what exactly I have to do in order to extend my wife' residence permit?
Thank,
Marko