S.H.
I would be careful yourself.
Because, the Ex knows probably, who her friends are.
What if he contacts you for information about her?
Your "job" as a friend, is to keep her information and life, confidential and private. That is how you can help her.
Or she will be in danger.
Just look out for her.
And if her Ex is going to lose his job and license... then he will hit another rock bottom... and he may get even more volatile.
So look out... all of you, for that.
Be safe. For yourself and for her.
If you notice anything about him or what he is up to, alert her or the police.
Make sure he is not following you or anyone that is associated with her.
Because, he will probably... want to find out where she is. Somehow. And he is volatile and not in his right mind.
If your friend needs money and you can help her, then I would help her.
Tell her she probably needs a P.O. Box to get her mail etc.
And so that her Ex cannot learn of her street address etc.
She has to stay in hiding. And who knows for how long.
Her Ex sounds like a ticking time bomb.
And, she needs to alert the school that her kids attend. Because what if he tries to kidnap them? (if she has kids that are in school).
I assume, the women's shelter or whoever is helping her, has given her a lot of information and resources to help her.