the 'life in uk ' test and the English language tests are 2 different things,
the life in uk test is not just a test on her level of English but also about British culture etc

so unless The course your wife took included citizenship materials derived from the document 'Citizenship Materials for ESOL Learners' (ISBN: 1-84478-5424). then she will have to take it.

http://www.ukba.homeoffice.gov.uk/br...h-citizenship/

http://lifeintheuktest.ukba.homeoffi...ground_10.html