Your daughter's friend is a believing walkaway. They are lost. They are not comfortable there and they are not comfortable here. They tend to live with a ever present feeling of impending doom, an apocalyptic view. They feel guilt for not behaving as they were taught and they are frustrated at not fitting in with secular society.
They are usually socially stunted and have chronic relationship difficulties. They have difficulty planning for the future and have a hard time making decisions and often are poor at following through on commitments made. They tend to make poor partners and are prone to moody episodes and outbursts of rage. They are selfish and self centered and immature and impulsive in many ways.
Many of us fit this profile and we recovered and learned to grow and adjust to life in the only real world. Quality exit counseling helped a number of us and I suggest it as standard treatment for a victim of a high control group like the JW's. Recovery is advanced when we loose our fear of churches, religion, holidays, flags, politics, voting, blood medical treatment and when we quit having guilt spasms and floating episodes.
Best wishes to you, your daughter, your grandson, and the walkaway boyfriend too.