S.V.
double of everything. but i think the best thing would be help. once the newness of the twins runs out after a week or so of people always wanting to see them, she will need time for her self, time with her husband, and time with her other child. i did not have any help with my twins and my husband went back to work after 2 weeks, it can be over welming.
Cook meals and freeze them so all she has to do is take them out and heat them up.offer to help clean the house. or even give her a basket full of stuff to pamper her with.
good luck