I would ensure all separation arrangements, including finances, access and custody arrangements are clearly set out in a written agreement at the point of separation.
In fact - if you haven't done so already, I would consult a L and seek advice on how best to protect your own interests and those of the kids in the event she chooses to leave.
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus
