In high school I doubt her use will be very demanding hardware-wise; she would probably be fine with a base configuration of either the TB or nTB version. Although I would advise against the 128GB configuration; I think 256 is more reasonable especially if she will store any media on the laptop (music, movies, photos, & the like).
Is is worth the money to step up to the TB model? That is going to be personal preference... aside from the touch bar, I don't think any of the other included features would be of particular benefit (28 watt CPU, faster RAM, etc).
This will be a hot-button issue, but I seriously doubt she would benefit from 16GB of RAM; 8GB will likely be enough for the foreseeable future. I doubt she will be multi-tasking beyond iTunes, a few Safari tabs, and Office/ iLife suite.
Any idea what she would be using the machine for? I am making a lot of assumptions...