Just figured I would note that Fedora does not win cost. Fedora costs between 19 and 16 to deploy when awakened. Marr costs between 17 and 14 to deploy when CC'd or Awakened. While it's true that a min cost Fedora will cost less than a max cost Marr, and is going to be easier to obtain as Fedora is gold rather than plat, it still i a bit unlikely for most people to manage such without paying or luck, and similar could be noted for getting duplicates of Marr to get her that one CR needed to match Fedora's lowest price.
That said, Fedora is a decent 2nd or 3rd healer if you lack better. I have better and plan to eventually level mine. As noted though, she isn't really necessary if you don't want to use her or bother with leveling her.