I had the same experience when I got mine about a month ago. Pretty much every status was blank where my wife's name appears. So I searched the forum and found out that they wouldn't disclose the info other than the main applicant due to the privacy law or something.
So I ordered another GCMS which I should get in a week. This time I submitted IMM5475E as well for my wife's status. Having said that I'm not entirely sure that this would disclose my wife's status just because I haven't got it yet. I will find out in few days. I don't know if anyone here tried with IMM5475E. You can wait until I get my GCMS before you request another one. I will post if I get my wife's status this time.
BTW, if you look at GCMS request form (IMM5563E), it is noted in the first page under Section A- Details of Request for requesting the info for another individual. And you can find IMM5475E from the following link.
http://www.cic.gc.ca/english/pdf/kits/forms/IMM5475E.pdf