Re your children. This is not just about their emotional wellbeing. It is also about their physical safety.
What if she needed to go to the ER?
What if she was carrying one of them and fell down the stairs?
What if she decided she needed a little "snooze"?
What if she left the stove unattended?
etc
etc
She should not be caring for them unsupervised at that level of drinking. Please put childcare in place before you do anything else. Like, today. Because CPS will if anyone finds out that this is happening.
Then maybe read the stickies and figure out where your nearest Al-anon meeting takes place.