I look at this VERY differently. One of the biggest causes of hand fatigue is a combos balance! Also the shorter the rod will require more effort to get the same distance.
I learned a lot while teaching and helping my wife (then girlfriend) as she became addicted to fishing. She is just under five feet tall with a small frame and small hands. She not only can handle most any spinning gear from ultralight to heavier saltwater stuff, but also fishes with some 9 foot fly rods. It was always about proper balance.
I would start off by looking at some high quality spinning rods. Dobyns has a full lineup in the Sierra Series. There are a few in the Fury series, but I would stick to the Sierra series for better options. They are made using a better blank and offer more actions. They even offer a 7 ft 5 power rod that my wife loves for frogging. I would look at two rods. First I think the SA 693 SF is an all around perfect rod for her. She can throw all of the usual finesse baits on this. I would match it with a reel like the Okuma RTX30 ( very light) or a Pflueger President 30. If she already has a good spinning rod for finesse baits ( grubs, tubes, light texas rigs, shakey heads, ned rigs etc,) then forget this one.
My next rod would be the replacement for a baitcaster. It would be a Dobyns Sierra SA 704SF. That rod is built to handle jigs, texas rigs, Sencos, Flukes, but also baits like spinnerbaits, buzzbaits and even some topwaters. It would balance nice with a Pflueger Supreme 30 or 35. My wife's SA 705SF is the next up in their lineup and it weighs basically the same as a 704. It balances great with a Supreme 35. Of course it has 30 pound Power Pro braid on it and we throw mostly frogs but it makes a great option if we want to toss BIG jigs deep on ledges out in Tennessee river impoundments.
If you really do want an all around baitcasting rod then I would call the factory and tell them you are looking at a Fury FR 663C, a FR664C , and both the Sierra SA683C and SA684C. The Sierras have nicer blanks, but full cork handles. Ask if the Sierras weigh more or less than the Fury series. I have held many of the Dobyns rods, but never one of the 6 footers.
If you go the spinning rod route now she can always add a baitcaster to her arsenal later and she will still have a very versatile spinning rod as well.