I don't even think there had to be an especially good reason. Sometimes, chapters decide to release girls for reasons of "fit" which might boil down to the girls just being kind of plain relative to the rest of the PNM pool.
I personally hate that, but I think it happens every year probably within all of the NPC groups.
If the mom really wants to know, she should work within her own group, but there's probably no good that will come of pursuing it.
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