Wow student that is awesome. I would just keep encouraging her art. Everytime you see her just keep praising her, and telling her how proud of her you are because of her accomplishments. No one in the cult will praise her for "wordly" things.
Keep commenting on her non-JW bf. Tell her how glad that you are that she has someone in her life that will understand her, since he also is creative.
Remember "you can catch more flys with honey than vinager."
Good luck keep us posted.
Leslie