I don't think she will ask for PT again. I think she will quit come April or soon after. She not want FT for her mat leave, never has. She will do it for little while after baby born and then she will quit.

It better for her to save 12 month FT fees and then in April 2016, she just need four months care for both children before older go to school. Make no sense to pay 12 months fees to keep a spot she only use for 4 month. She will quit by June.