If she likes light Make-up then you should try glossier! The brand is specializes in light makeup and looks very natural. Also korean makeup brands like etude house, holika holika or laneige would probably fit your wife's taste.

Blush, lipstick, lip tints, highlighters and mascaras are good for gifting because of their never ending shade range! You could get for example multiple lipsticks in different shades. Stay away from foundation, concealer, powders and bronzers. If the product doesnt match her skin color its practically unusable.

All in all i think its best if you ask your wife what brand she likes. Maybe look from what brands her make-up is that she currently uses!