What is the intent and does it involve married or single parents?
file for custody in state of childs residence
The state the child is in.
Yes if she could prove that the child is better off in her primary care. If the child is thriving and safe with you, it would be hard for her to prove. But custody can change at anytime so she has the right to file.
A motion for custody or modification to an existing custody order must be filed in the jurisdiction where the child legally resides.
That depends on the custody order, but she can file for a change of custody.
no
Not if she was abusive
You have to file a child in need of care motion in the other state.
That depends on which state retains jurisdiction.
All states follow the Uniform Custody Law, except for Massachusetts. If you plan on making a permanent move however, you will have to file Custody orders in said state, because these are state laws.
You must file a motion with the court requesting a custody hearing.
File a motion to modify