If the daughter of a night hag avoids her mother long enough can she delay becoming one too?

The daughters of other hags all seem to fully turn into them automatically once 13, except with night hags according to lore. With them it’s said that there must be 13 rituals done on their daughters or the transformation doesn’t occur.

So for campaign purposes I have to ask: does this mean that it’s possible for a daughter of a night hag to be encountered who is older than 13 and thus far been able to evade their mother and being converted? Can it be delayed with them from the usual mandatory age?

And as an aside, if it is possible and such one is encountered, would they be a regular human e.g. stats wise or would there be differences? And would spells used by a party that could detect and reveal a hag also detect them?