You should consult with an family law attorney. Immigration status does not influence a person's ability to collect maintenance. Whether the wife is entitled to maintenance is the question you must ask to the family law attorney. Good luck!
You still qualify to apply for "VAWA."As a battered spouse of USC, you can file an immigrant visa petition without your spouse's signture/knowledge. This allows victims to seek both safety and independence from their abuser, who is not notified about the filing.
Consult with an atttorney. I wish you luck.
I agree with my colleague. Please review 2013 HHS Poverty Guideline Affidavit of Support. You must add the number of household plus 1 (for your mother) for the sponsor's household size. Anyone with USC or LPR status can sponsor.