I'm a little late adding to the advice....but speaking as a mother of 20 month old twins, I know what helped me the most:
DIAPERS---people even bought some a few sizes up which was nice
MEALS---I absolutely couldn't cook. Neighbors and friends from church and work would let me know ahead of time and bring a meal already prepared (by themselves or a restaurant). Some even stayed to hold a baby so we could eat. The best even bought an extra meal to stick in the freezer that I could pull out when needed.
TIME---People came to help out for 1-3 hours. It allowed me to shower, eat, take a nap, or just have some company and assistance.
Having two babies offers so many more challenges than one. Those first few months were HARD. I enjoyed my babies and tried to savor each moment. But I couldn't have survived without help. The cute gifts were nice but the above was what fewer thought of that saved my butt. : ) You can always buy a cute gift and take with you when you offer help or a meal. : )
Hope your friend enjoys her twins. Tell her it gets easier. I wouldn't trade the experience. I love having twins.