In Nov last year my ex boss Mon has left the company. Few days before she left, my colleague and I treated her lunch. Thus the silent treatment broke. I give thanks to God for that. Please do continue to pray for her that she will have a desire for God. Pray that the Holy Spirit will heal that traumatised child within her and tt she herself is willing to be healed. I know tt in Internet a lot people said covert narcissist very hard to heal. But God said in His word nothing is impossible. Pray tt she will know the truth and be willing to face it.