What to Do?

Where do I start... My brothers fiance' try to commit suicide I guess.
She stabbed herself 9 times 8 suprfical 9th one caused a blood clot to her heart. She called 911...... Okay the rease she did this is because she was about to get caught
stealing from my brother. She forged his name on credit cards and her student loans. ( she did this 2 years ago also $50,000.00) and the only reason my brother found out is the credit card company called him. He told her if she every did it again he would leave her. Well thats why she did this to her self she did it again and was getting caught. I am so hurt I feel alot of pain for my brother he is a hard worker put himself throught college,> I went to the house and saw everything she did and I had to get it cleaned up before my brother came home it was awful noone should have seen what I have seen. ( I got a cleaning company out there the next day). I do not like her I can't except what she has done to my family the where getting married this year and she still thinks they are...My brother hasn't told her yet afaird she might do something again...Is this the way it has to be tippy toeing over her. Our integrity is gone nobody know the truth they think she had a blood cloth to the heart.. We where tring to protect her then the truth came out..And she didn't tell us..We found the information when we went through paper work......My question is do I have a right to feel this way and how do I tell my brother because I really not sure how he thinking I know he is seeing a therapist our they going to tell him that she will do this again ( stealing suicide) I can't even look at her I can't pretend nothing has happen I don't know what to do. I wake up in the nights and know that I have been crying..I am so worried about my brother. I want him to leave her and move on he doesn't deserve this.But not sure how to tell him I am afaid that I might loose him
because she good at mind ganes and will confince him she will never do it again and I know love is blind. What do I do....