Any of the shimano shifters with the gear cable coming in at the side would be great for small hands. I think the shifters on the islabike website are probably 105 10 speed shifters from the 5600 series.
The great thing about these is that the brake lever pivot is really high in relation to where the palm of the hand sits so it’s much easier for small hands to reach further down the lever. Same with the shifter lever.
Mike