As long as that’s her own hair, I think that is hella nifty. It says she had the personal discipline to grow her hair out, but then also wanted the option for switching back and forth between long and short hair on her own schedule, and not tied to her follicular performance.
If it’s not, it’s just as superficial and fake as any other hair extension.
And I would say this about anyone, not just women. Hell, if I could do the same with my beard in a way that actually looked decent and would not be widely ridiculed, I would seriously consider it. Because just like long hair, while any mountain man can sport a scraggly mess, a good beard takes years of discipline to grow into a well-coiffed mane.