The BBC's Charles Haviland in Colombo says that it appears that the maid's passport was falsified to give her age as 23 when she went to Saudi Arabia - other documents said to be genuine show that in fact she was only 17 and therefore a child.
Now, one thing that parents should bear in mind is that, at age 18, a Junior Isa (and CTF for that matter) goes straight to the child and therefore it is entirely their decision what the money is spent on or if the money is to be left invested (rolled into an adult Isa, for example).