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This poor girl. If the nanny was so attentive and loving, why does it seem the girl was raised by wolves?
I think the LW probably exaggerates. Yes, teenagers can be very clueless, clumsy and dippy. More so if no one has taught them how to be self-sufficient. I am sure whatever life skills the LW believes she learned by osmosis or intuiton were actually taught to her by someone loving and patient.
If the LW is more than an immature gold-digger in her relationship, she might find some compassion for this lost soul and try to befriend her, and mentor her. But I think that is probably unlikely. As it is, she is wondering about the possibility of marrying this 16 year old off. Bronte sisters indeed!
Perhaps the best outcome is for the nanny to become a permanent guardian or adopt the girl (with full financial support from this poor excuse of a father). Four years of once a week dinners with her father and his girlfriend after being traumatically abandoned by her mother in a foreign country?
Such a special family.