Depending on the rate you have it may not even be worth it to refinance. I did an initial quote and the rates were higher than my current rates even if I shortened the term to 5 years (my highest rate right now is 4.875%). Also, be aware that most of their low rates are variable based on the Prime or LIBOR which are both currently at historic lows. If you anticipate the loans taking more than 5 years to pay off I would expect the rates to go up so keep this in mind in your analysis. For example, when I first graduated my rates were based on the 3-month libor +2.89%. The 3-month libor at that time was 5% or so. The past few years it has been below 0.5%.
Also, you say she is unemployed. So you would have to cosign, and you would be losing all the federal benefits of deferment/hardship by consolidating I believe (would have to check this out). Off the bat with little information you are providing it does not seem worth it. If she has 8% loans then that is a different story.