I saw this movie around 1989. A husband tries to get rid of his wife by throwing her off a boat into a crocodile-infested river. She is assumed to be dead by her husband. I think he marries another woman/mistress. However, his wife survives but is badly wounded in the face. She sells all her gold and jewelry to pay for plastic surgery. She gets a face lift and appears completely different from how she used to. She visits her son at school (without meeting him face to face). He suspects her at first, but she puts on sunglasses to disguise herself (since he thinks his mom is dead). She does this to plan revenge on her husband.
I forgot how she commits the revenge.
What is the name of this movie? A link to IMDb would be great.