I could make that harsher and more vivid, but if she wanted the child to be discovered, she could've taken the baby to the closest hospital, police or fire station. Of course, if she went, she'd be asked questions, including (possibly) her name and someone would find out.
The time to make the baby's presence known is long before birth, so the mother and child could have prenatal care and give birth under medical supervision. Instead, like so many other tragic cases, she hid her pregnancy, hid the birth and hid the disposal of the child.
I'm very glad the child was found in time and survived. And I do hope that a good family can be found to adopt this precious child.