Is a woman allowed to tie tzitzis for boys?

A woman is qualified to attach tzitzis to a garment, Some authorities, however, disagree and hold they are not qualified to attach tzitzis to a garment, because they are not obligated to observe the mitzvah of tzitzis.

The law follows the first opinion. Nevertheless, it is initially preferable to make a point of observing [the stringency of] the latter opinion.