She doesn’t qualify for an OWP which is why you were told to apply for a TRV. The TRV is far from guaranteed. The IRCC agent was pointing out what she should apply for if she wanted to attempt to come to Canada before getting PR. Impossible to say how long it will take to get processed. Chances of success are 50/50 at best. Will partially depend on current employment, savings, other ties to her home country, previous international travel to places like the US, UK, Australia, etc.