I will add to the points that pirka mentioned. The health benefits vary states to states. In some states she can get "medicaid" or "CHIP" for her kids and some kind of subsidy for herself, whereas in other states she might be able to get medicaid for her as well. Regarding the "money for the kids", she will get $1000 per child when she files tax. And she can also get food stamps. Other than that I haven't heard of any other benefits. I am assuming she is coming as a permanent resident.