All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
The wife whom you mentioned in the question should not have informed her parents about the matter because the intimate relationship between a husband and wife should be kept top secret between them. However, if it is confirmed that the husband is sexually impotent, then the wife may ask for divorce, but impotence cannot be confirmed in one night.
In addition to this, a Muslim should not indulge in such matters which do not concern him by asking the reason why the husband was not able to have sexual intercourse with his wife. A Prophetic narration reads: “The sign of one’s good faith is to shun that which does not concern him.” Furthermore, people should not spread such news. Strange indeed! Look at how this news reached you despite the fact that it is a matter of the uncle of your friend’s friend. We are very astonished how quick you spread this news though it is a personal matter that does not concern you; if a Muslim came to know it, he should keep it secret.
In general the inability of a husband to have sexual intercourse with his wife may be due to exhaustion and the like. Therefore, one night is not enough to rule that the husband is impotent, or affected by magic and the like.
Even if he is affected by magic, getting well by treating him with Ruqyah is something possible. However, when ignorance is coupled with hastiness then the matter is worse.
As regards interpreting dreams, then this site is only specialized in Fataawa (issuing religious rulings). So you may ask people who are specialized in the interpretation of dreams.
For more benefit, please refer to Fataawa 91308, 91301 and 89334.