My congratulations to you and your daughter for thinking big thoughts. I hope it inspires her to take up a career in aerospace or space sciences. If you want to see some eye-opening videos, go to YouTube and search for Gateway Spaceport LLC to watch together. I would dearly love to see this firm build a working prototype of this technology up on orbit. As to "why bother when we can launch from Earth", well just look at the scale that this firm is working at, and you figure out immediately that they are designing structures at orders of magnitude bigger than can be directly launched.