Because six years for a 19 year old cyclist is essentially a lifetime ban. There is little to no chance of her returning to the sport after that kind of extended absence.
I dunno, it seems pretty harsh given that drug doping cases on the men's side only receive 2 to 4 years for a first offense [1] and given it's not something she could have gone out and done on her own - coach and mechanics must have been highly complicit and were probably driving the use of the cheat. https://en.wikipedia.org/wiki/List_of_doping_cases_in_cyclin...