Although nursing schools are regulated by the MOH. Principals of each school hold a lot of power.
If you want her to continue schooling 3 weeks after giving birth, all you have to do is discuss the issue with the principal of the school.
Normally she is supposed to defer for at least 1 year but there have been several cases where students were allowed to continue schooling right after giving birth.
Once her family is willing to take care of the baby and she can handle the social dynamics of the nursing school, it shouldn't be too difficult to convince the principal to allow her to continue her studies a few weeks after delivery.
UN convention on pregnant students apply here, but do not bring that up during a discussion with the principal.
The best case scenario is to appear to be pleading with a powerful principal to accept what you envision for your child.
Its only after the principal refuses, then you can bring in higher authority to draw her attention to conventions and laws concerning women in education
What you are asking for is not that difficult to achieve.