Uma Rival Perigosa

I was watching this movie on Friday,Apr 7th. I didn't see the last scene ( cos I was talking with my bro n Mom in law at the same time ). Anyone can tell me what happened to her?I watched slightly that her husband was hearing someone was talking to his wife in the bedroom and then he opened the door,she's dead already.

What happened to her? Did she kill herself? How could she arrange everything like the phone calls,meanwhile she's at home when her husband was talking to this strange admirer?Anyone can explain to me,please. I am so so curious!! ( in the end,I read that she suffered from Multiply Disorder Personality ).

Thnks before.