As I understand it, she will need 39 Qualifying Years for a full basic State Pension because her 60th is before April 2010. So yes, she would at first sight be appearing to be unable to gain from the changes that occur in April 2010. The line has to be drawn somewhere.
However women born after April 2010 have to wait progressively longer to receive their Basic State Pension (based on their 30 Qualifying Years) as there is a changeover period during which the age to receive the sum rises for women from 60 to 65. This was to equalise to men, and the outcome of an EU Court case several years ago brought by a man (who foolishly thought the Government would reduce the age for men from 65 to 60!). Your wife avoids being disadvantaged by this change.