Life is constantly changing and I think being financially aware is never a bad thing. Most of what we do uses money and learning how to make the most of it can help out a lot. And with new technology or conditions, there could always be a better rate. The only thing I have to say is to consider the advantages and disadvantages. It might be cheaper to get a adjustable mortgage rate but rates could always go up if it's not fixed.
It might be better for her to stay put, or refinance with the same bank again, after shopping around and threatening to leave. For me, I am stuck for the next 7 years with the loan I have, with a very nice collar on the interest rates :)