(Emergency) Hearing in family court. At $300 per hour will likely cost around $800 to meet with and get all paperwork filed for this hearing. Then another $900 to have lawyer in court. In CA each has to meet with Court Counselor first and, they summarize and make recommendations to court.

Also dont go off or threaten her you will take her to court, say you will get 100% custody, call CPS, etc. It could tempt her to just run off to MT and that would make it 100x more difficult on you and cost 100x more time and $.

Perfect time to review with lawyer the current Court Order and request Joint Custody with a Visitation Schedule, showing you provide more stability. Courts are pro father getting more time with kids generally and anti mother doing things like moving to cause "alienation of affection " of kids toward the father.

Document, document, document...take screen shots of texts she sends and send to your email to save if ever needed. Keep a journal, write down and date things kids tell you or when she breaks the agreement of visitation. Keep a copy of the Court Order in your car in case you have to show it to a cop, and they could enforce it.

My ex and yours sound like sisters, sorry but fight for them and they will recognize it when they are older.