My sister-in-law left the Catholic Church about 10 years ago and joined the Jehovah’s Witnesses. Her “incoming threat” radar is turned to absolute maximum, and any slight religious comment is interpreted as a major attack. She also won’t accept religious literature. Is her soul in trouble? How can I love her back to the Church?
This does not mean that one should capitulate to Jehovah’s Witnesses sensibilities. I wouldn’t take a crucifix off my wall or anything like that. If she wants you to accept her the way she is, she needs to accept you the way you are. Be a loving Catholic role model for her, pray, and by God’s grace things may turn around.
Regarding her soul, there may well be danger there. We cannot see her heart, and what you should do is simply be a loving brother for her and entrust the care of her soul to God. He works miracles.