The g'mara on Eiruvin 82b explains that a man can make an eiruv for his minor children and Canaanite slaves without their consent, but for adult children, his wife, and Hebrew slaves they must consent. A wife can "not consent", it says, by making her own eiruv. (This makes me wonder what could be going on in the household to lead to that, but that's not my question.)
So a woman can make an eiruv for herself at least, and a man can make one for his household, including his minor children. Can a woman who has no husband make an eiruv for her minor children, or does she need to find a man to do this for her? I'm asking about her ability to make the eiruv, not about consent.
Is the answer different depending on why she has no husband (widow versus divorced versus unmarried mother)? If she can't make an eiruv for her children, who can?