First of all try to get her to look into Dr. Thomas Brewer's blue ribbion baby diet. It worked for me and my twins were born 39 weeks 5 days and weighed 7 lbs 14 oz and 7lbs 15 oz.
Next I sell in my newly opened homebased breastfeeding business the EZ-2 Nurse breastfeeding pillow. If she chooses to bottle feed it works fine for that too. I could not have nursed without this pillow!!!! They sell for $56 + shipping.
I also sell the Medela breastpumps and accessories. If she is working full-time the Pump-in Style is what she will require and they range from $309 - $349.
Line up people to deliver food on different days or have her give you the shopping list and go do it for her. It is unbearable trying to shop with twins!
My family was not much help when the twins arrived either. People just do not have a clue how hard it is unless they have been there and it is not comparable to singleton babies! SHe will be tired and stressed so just listening to her may be the best thing!
if she is not using cloth diapers then through her a diaper and wipe shower. You would not believe how helpful that is!
Hope this helps!