Does a man become permanently unmarriageable to the girl's mother if he has an Islamic marriage contract with her, and they have a legitimate private meeting (khalwa shar'iyya), but he does not consummate the marriage, and then they separate?

The mother of the wife becomes forbidden [to marry] simply by the marriage contract with her daughter, according to the Almighty's saying: "and your wives' mothers," without stipulating consummation with the wife. This is the view of the majority of scholars.