I'm with
@Veritybelle that the Kelly 28 retourné is the sweet spot in Kellys (this might be why I'm about to order my fourth LOL).
I love Kelly 25, but for where I live (cities with walking and weather) it is wonderful to be able to add a shawl, a mini umbrella, even a tiny water bottle to my bag.
I also think mini bags will trend down and all this size 25 mania will go away, while the 28 will remain on the smaller side of forever classic.
I am 5'2" so smaller than OP, and K28r looks just fine on me, so it will look just fine on a 5'7" person.
ETA: remember retourné looks smaller than sellier, but holds more.
Try it on. You will know when you see it.