Have you considered tingkat? Some companies are able to do tingkat lunch for 1 person. It's definitely better than starving yourself or rushing a meal. And at least you get to eat your food in the comfort of your own home, at any time you want.
You can check out these tingkat companies:-
http://www.lexin.com.sg/tingkat.html
http://www.empirefood.sg/tingkat/
http://www.kimskitchen.com.sg/Tingkat.html
http://www.selectcatering.com.sg/tingkat-delivery/
Some companies also do 5 day trial for you, so you can taste their food before committing for a month.
With regards to your mil, I think you will need to have a chat with your husband. From what you wrote, it seems like she will be the main carer for your child after your maternity leave? You will need to establish with your husband if she will continue her existing lifestyle after you go back to work. If she does, who will be looking after your child from 12-5pm? Let your husband do the talking because usually DIL is always wrong.
As for weekends, is your husband able to help you look after your baby? Maybe just for a few hours so you can go out and have a breather. Do your nails, cut your hair, or maybe a short lunch with your friends. It is definitely not healthy to be confined at home all day as unhappiness can lead to post natal depression. Tell him how you feel as that's most important in all relationships. Don't bottle yourself up.
Hope my post is useful. Take care.
Anonymous