She's spinning on a supported spindle, where the point is rotating in and supported by a cup or bowl. The drop spindle hangs from the yarn that's being made, so when the yarn breaks, the spindle drops.
You can still drop a supported spindle, of course, but it takes a higher degree of cack-handedness. (AMHIK
)
What spindlers say is
A wheel is faster by the hour, but a spindle is faster by the week
In that, whilst a wheel spinner and a spindler sat side by side, the wheel spinner would most likely make more yarn in the same time, as the spindler can spindle for odd moments and when s/he is out and about, over the course of a week the spindler's output may well exceed that of the wheel-spinner.
Having said which, at Wool on the Wall we had a number of very experienced and proficient spindlers spinning yarn alongside the wheel spinners - and they were not noticeably slower