The onus is on your wife to convince the visa officer that she will leave canada at the end of her permitted stay. If she has a 2 month visa,then why would your wife leave canada (rather than stay on) at the end of 2 months?
Possible reasons include that she has a 200,000 dollar flat in India, she has 30,000 in a savings account in India etc. These ties are indeed quite strong- very few people would abandon a 200,000 flat or 30,000 in savings. Most people would want to return to do something about these assets.
The visa officer is less concerned about your long term plans as he is about your plans relating to the current visa he needs to decide on. So again, if he is granting a six month visa, he is concerned about whether you will stay on in Canada after those six months, if he grants your wife a visa.