Thank you for your response, and I apologize for taking so long replying (I had to contact her to get details).
They had an apartment in South Carolina, and he got a job in California. He moved out there and rented an apartment (in his name only), then he told her to ship all the property out there. When the lease was up in South Carolina, she and her daughter flew out to California, where he told her that she was "not welcome in his home" (probably not legally enforceable at the time, but she wasn't thinking in those terms at that point).
She flew back to South Carolina, and a few weeks later, he flew her daughter out to SC to leave the daughter in her mother's care. At about the same time, he began co-habitating with a woman he had recently met. He cut off all financial support to his wife and drained all accounts she had access to, which forced her to live on the good graces of friends until she can find work.
Now she has moved to Maryland, and is building up residency here (still without support, living off friends). He is threatening to file for dual custody where he takes the child for alternating years, pays no alimony, pays minimal child support, and gives her no portion of their assets.
I could see how she would possibly qualify for residency in SC, but not CA, and probably not MD (I think MD requires six months before residency is established).
The trick, I think, is to find out where she should get support from, so that she can then start looking at pro-bono support in that area.