I feel for you I truly do. I wish with all my heart she gets to be strong enough to get the help she needs.
With all the police reports, she is probably listed in medical and police records of being a suicide, medical crisis risk. I wish I could say for certain that she would be found out during the medical or during the interview. I just don't know, but you do need to know what you are getting into. Your safety and mental health are also at risk.
Have you thought about moving in with her and staying in Canada so you can get her help and find out more? Maybe away from the family as they keep covering things up.