I’ve often wondered if her parents believed her.
The wise men visiting Jesus was foretold in the Old Testament. Just the other day I wondered why they were so important to be included in prophecy. One thing I got to thinking about was that perhaps one of the reasons they visited Jesus (when he was perhaps two - and back home with his family/tribe) was to be a witness to the family/tribe that He WAS the King of the Jews, and that a miracle had happened. Sort of a third-party, unbiased witness.
Also, the wealth they gave Mary and Joseph no doubt served them well when they had to flee to Egypt. (Of course if they hadn't visited and screwed up with Herod - they wouldn't have had to flee!)
But, by fleeing, and being refugees, and I suppose outcasts - Jesus experienced one more thing that so many of us experience.