see links below
not without court approval see link
No, she can't. She must be 18 or married to move out without parental permission. Just because she can get pregnant does not show the good judgement to be emancipated.
Legally minors are not allowed to choose.
see link
In Michigan, there is no specific age at which a child can choose which parent to live with. However, the court may consider the child's preferences if they are deemed old enough and mature enough to make a reasonable decision. Ultimately, the court will make custody decisions based on the child's best interests.
Can you choose to move with a friend at 16 in Michigan?
Generally, custody orders end at age eighteen and the child can choose where she wants to live.
to artificailly get pregnant you can go to a sperm bank and choose a donor. to artificailly get pregnant you can go to a sperm bank and choose a donor.
see related question
If the step parent files for custody, and the judge awards custody of the child to them.
i think that its 12