The only kind of children society should encourage is those in stable financially-secure families.
People who make bad decisions will often go without resources. Society thus diverts resources to people who make good decisions. Things work better this way, with much less waste. We get more messed up families if government pays people to have messed up families.
I don't think that "she mothered too young". There is nothing wrong with age 16. The problem is instead that she didn't first find a suitable husband to support her family.