Hi lee71959,
I would make sure that she’s aware that “medium firm” really has no specific meaning and can vary from manufacturer to manufacturer and because firmness and softness are also so subjective … it can also vary from person to person. The best way to make sure that the Rhapsody Breeze would be a good match for her would be by using the testing guidelines for PPP in the tutorial post.
Some of the better online memory foam manufacturers or retailers I’m aware of are listed in post #12 here and several of these make or sell a mattress that uses the Rhapsody or Rhapsody Breeze as a reference point. The pros and cons of each one would depend on the parts of your personal value equation that are most important to you.
You can also read a little more about the different ways that one mattress can “match” another one in post #9 here.
There is also more about the cooling benefits of gel memory foam in post #9 here which in many cases may not be as great as some of the marketing stories in the industry may lead their customers to believe. The temperature regulation of a mattress is usually the result of a combination of factors and not just the type of foam used in the mattress. There is more about the factors that can affect the sleeping temperature of a mattress in post #2 here.
Phoenix