Everyone has gifts to share with others. At the very least, the Christian in a state of grace has the supernatural virtue of charity, which can and should be developed by self-denial and acts of kindness.
In the case of someone very attractive, one form of expression of this charity might be modest dress, self-restraint, and expressing oneself in a chaste manner, out of consideration for others (which we should all be doing anyway, but for such a person it might be done with greater care, and might be more of a sacrifice and therefore more meritorious).
Good looks and sexuality can be a beautiful gift to give to a spouse, and there’s nothing wrong with that. But there have been nuns who were very beautiful, and gave the gift of their looks back to God, so that they could serve his Church more fully in other ways. Some of them became saints.
But I suspect the person in question has other gifts also, including spiritual ones, which might be discerned better with help from a priest or from friends. Some parishes have talks and retreats for this purpose (“Discover your spiritual gifts,” etc.).