women - Implications of gradual gender change at age 12

In the village of Salinas, Dominican Republic, about 2% of the females (as determined by external genitalia) gradually morph into males at age 12.^[​1][​2]

If such a child was Jewish and accepted as female upon birth, several interesting situations could occur:

1. The person was married to a male after age 12, only to then turn into a male.


2. The person, thought to be halachically an adult (since girls mature at age 12) performed acts of halachic bearing, only to then turn into a male and therefore losing status as adults (since males mature at 13).


3. The person would supposedly need a circumcision, but at what point in the gradual transition would it be performed? (Asked by CashCow.)

What would the halachic implications be?