Taking the devil's advocate position here....
Maybe she's outgrown your friendship?
While her JW beliefs may have something to do with it, some times friends drift away from each other, particularly in the post-school years. She doesn't have the emotional maturity/social skills to break it gently to you, so she's been ignoring you with the hope you'll get the message. Hence her short reply to one text, but ignoring everything else.
Don't waste your time worrying about her. Move on with your life and make new friends.