Steps after getting work permit via spousal petition

Hello, my mother received her work permit today, she is being petition for by her husband. I have it understood that once you get a work permit your next step is to get a social security number. Her Work permit is on Category C-9. Her lawyer has told us that she cannot get a social security number yet, but my better judgement tells me that he's full of bs.

Yes she can

Fire the lawyer. She can get a SSN.

Hows she going to use her work permit without a social?

I figured as much, but I rather have it confirmed. Lawyers: the profession for idiots.

Make sure that this guy has an AILA certification. You have all kinds of idiots who barely passed the bar get into areas they shouldn't touch.