GS mini remains active all the way to touchdown. If the wind you entered in the FMC is accurate, then there logically would be no additive to Vapp on touchdown as the (Current headwind component-TWR headwind component) would be the same and equal 0. As your headwind decreases the lower you get, the less active GS mini will become in this case.
If however you enter an erroneous wind, say 220/10 where the actual wind on the runway is 220/20, then GS mini will keep your speed higher than Vapp till touchdown as it is still anticipating a drop of 10 knots. Which is a big gotcha!