She needs to document everything, with dates and times, but put any writings etc, in a safe place away from the husband. Write a diary of events, of stresses, of impacts, of the shoving etc. Maybe she can give the diarys to you, to keep safe from her husband. She needs to keep receipts as much as she can of his spending on himself.
document document document.
Then if she gets up the courage to have him removed from the house, even if just a separation, she will have what a judge wants to see. proof.