You need to very quickly get to court with a lawyer and file emergency petition, that is if the x has gone against your signed and legal court order. Don't waste time the longer your child is out of state the harder it is to force them back.
no
Most states lean toward Joint Legal Custody with primary residential custody
You could file for a court date that will address the fact that he is living so far away and that you do not believe that he should maintain joint custody but unless they choose to change the verdict then he still has joint custody.
It will be very dificult for the father to have joint legal and physical custody on the gounds that he is not avalible. The courts want the two parents to live in the same area to co-parent. He could if he moved back.
If you have Joint Legal Custody, then neither parent can physically change residences without the approval of the other. If, per the question, the daughter is living with the father, or the father has "primary" custody, then you can move wherever "you" want, at least in my perception.
I would say it would depend on how old you are and possibly where you live.
Only if approved by the judge.
Check link of laws, but you can file for custody.
The issue of whether the custodial parent can move the children is very tricky. If you are lucky, it was covered in the custody settlement papers. You need to read the agreement to see if it is there. If not, you need to contact your custody lawyer or family court advisor, and see how you can get an amendment to the agreement papers.
You have a moral obligation to let him know. Note that you can be sued for custody.
No, the orders need to be modified and approved by the court to allow that.
For 1) are you in custody of your daughter? If you are in full custody you could take her to court for kidnapping is your EX mother in law in custody of your daughter? Do you have joint custody? If your ex mother in law has no custody over your daughter you could take her to court, she is not authorized to take care of your child.