Queries pertaining to Border Patrol, Visas and immigrations are better consulted with concerned authorities or experts. Us Nepalese have a tendency of making a mountain of a mole and more often than not, a small event, occurence gets blown out of proportion and yes, we tend to generalize too. Just because one person's mom/relative didn't get to enter doesn't mean another's won't. There might be factors that could've led to the former's visa being cancelled.