Answer: Source confusion
Explanation:
Source confusion is the error in memory that occurs when an individual cannot recall the source from where the memory is coming after cit has been talked about or suggested.It is also known as source misattribution as it creates confusion in mind.
According to the question, the person not able to remember that why she thought that her friend got married because she is not able to remember the source of the marriage event.Thus,it is a case of source confusion.