My wife is 4' 10" and has tiny hands, with arthritis. The length of the mod is largely irrelevant to her, except for the additional weight, especially that above her hand. What matters most is the diameter (and again, weight). eGos are 14mm, 14500 mods are 16-18mm, 16340 mods are 18-20mm, and 18350, 18490/18500, and 18650 mods are 20-22mm. A telescoping feature typically adds 2 mm to the diameter.
I usually don't recommend more expensive devices without replaceable batteries, and my wife (thankfully) and I are more fans of mechs, but in your case, if the VW is important, you may also want to consider an
Innokin iTaste VV3, although it only has the capacity of an 18350, which is what you're going to get in a regulated mod the same length as an 18490 mechanical.