Is this fraud and what kind of trouble could she be in?

So my brother is incarcerated for and he recently asked me if I could check his credit just to see what it says before he gets out. He is currently married but filed for divorce over 3 years ago and is in the processes of finalizing it right now. So after I did a credit report and a people seacrh on my brother...we were able to see that his wife that he is dovorcing has opened up accounts while he has been incarcerated in his name without his knowledge or permission and has allowed them to go to collections. We were also able to find out that she currently using his name at her current address for utilities and phone connection. He is going to report all this since he did not give permission for any of it. We were wondering what kind of trouble can she get in?...Were in California by the way...