Gift for my boyfriend’s sister’s 30th birthday

Hi! Me and my bf are looking for a perfect gift for his sister's 30th birthday.

Since we've already bought her a Thai massage coupon, we'd like to add up something extra.

She's into hair care and has frizzy curly hair that she really takes care of.

The gift is a surprise and we've found 4 options (also mentioned in the pics):

1. Olaplex essentials
2. Olaplex set

3. Kerastase set

4. Give up on hair products and buy her a rituals set, because we don't know the type of her hair and her current needs

What would you guys recommend?

Are the hair products mentioned worth buying and are suitable for the most of people?

From my perspective, buying her a set of products would be more beneficial as she can test different products and find something she really needs or likes.

Or maybe you’ve already tested one of them and want to share your view on it