Softail Deluxe is the lowest seat on any stock harley. I had to lower the wifes another inch so she could flat foot it
+1 on that.
I have sat on all of the the others mentioned and the Deluxe is by far the lowest. I don't know where they measure from to get the seat hight, but the deluxe sure did feel like lowest. I would take her to the dealer and let her sit on a few to see what feels the best for her.