I dont believe there was any requirement to pay maintenance, although I have heard of cases where unofficial payments were made, but always for reasonably wealthy people.
It's possibly worth chasing up a baptism cert., as there's a small chance that the priest may have added some sort note or even listed a suspected father.
my guess (and it is only that), is that if James mother had to fend for herself she would have moved outside the area and looked for work - possibly in Dublin ? I seen quite a few occurrences (in my own ancestors and other) of Wicklow girls ending up working in Dublin as house staff etc.
I have heard of similar situations to this before, sometimes the young mother stays with the family, other times they end up leaving - or being asked to leave.
Shane