Soon To Be Ex Wife Says She Is Going To Run Away With Out 3 Kids

Long story short I'm in an inpatient program at the VA for the second time to treat my PTSD. I have made mistakes in the past that have had legal ramifications. I have finally realized that our relation ship is extremely toxic and harmful to not only us but the kids as well. I am 2 weeks away from discharging and my Ex hits me with an ultimatum. Either I stay with her and "work" to get in her good graces or, the takes the kids and dissapears while im still in here. Stating that she will make it as difficult as possible for me to see our children. Im kind of at a loss right now. I fear she will leave in the next couple days. Any advice would be greatly appreciated