Can she sue us for mental torture ? My son supports her in her say.

My son got married 2 years ago. The girl is from an affluent family. She is 2 years older than my son. For the first few months ,6 months or so everything was normal. A casual mention of a dowry given to my friend's son in his marriage triggered off sparks and then onwards small things would be made into an issue. She conceived in the 8th month and had some pregnancy problems. So she was shifted to her parents home and we assured her that as soon as she would be a little better , we would bring her home. unfortunately , the first lockdown , followed by another and then the state borders closure etc delayed our going to her parents home to get her to our home. Meanwhile , due to work from home, my son too joined her at her parents home and they were togrther. She delivered a still born in 8th month and noeshe claims that we were the reasonforthe babys death, and we have tortutred her mentally and also resorted to witchcraft etc to get rid of the baby. after a lot of repeated consoling etc she came to terms but her outbursts continued now and then. We were sure ,given time she would put behind all this and we would be united. but now, our son too supports her and has severed his ties with us. She has threatened us with legal procedures for mental harassment by us . Will this case stand in the court of law? what should we have as evidence to prove that we have never tortured her either mentally or physically? in the two years that she became our daughter in law we have not been together for more than 15 days . please advice