Is karma not real? Why do good things happen to bad people and bad things to good people?

My sis in law - she is a very poor student in school and uni and got a job in diff sector she studied. She had multiple relationships at a time, cheated on a few boys, and dumped a few without saying anything and without giving a reason. Now she got a good match who is very rich, well-settled has 3Million $ net worth. How is this fair? She is not rich. Her family is a middle-class family she barely earns 350$ a month. Now she is settled for a life and can quit her job enjoying her life in that lavish bungalow with all that bad doings in the past. Is karma not real?

Is karma not real? Why do good things happen to bad people and bad things to good people?
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