The only extra information you will see with your wife's login info is her address. That's it.
Here's a comparison - the first is when loging in as the sponsor, the second when loging in as the applicant.

See the 'In Process' links? They both lead to the same thing. So really, the only difference is that one shows the sponsor's address and the other the applicant's.
To log in with your wife's details, you will need the immigration file number, usually received with an AOR or another correspondence from the processing embassy.