Could her DH take some holiday? My twins are 12 days today, I have a 4 year old and a 3 year old and DH got 2 weeks paternity leave but has also taken a week of holiday. I think I could just about cope if he was going to work on monday but I'm glad he's not!
He's going to take our 4 year old to school before he starts work everyday and his dad is going to pick him up and drop him home everyday. I'm sure I'll be able to cope with my dd and the twins by the time he goes back. It might not be as hard as your friend thinks.
It's definitely not as hard as I was worried it would be. Is your friend going to breastfeed? If she is my top tip would be to try and get them to feed together - at least during the day, it saves so much time if you can feed them together also helps you to remember how much milk each one has had. I'm trying to feed mine every 3 to 4 hours in the day and although not a massive fan of routine living, I am trying to get them into a routine which allows me to care for DD too.
DT1 is sleeping 6 hours 12-6 at night (was 7lb 2oz at birth) and DT2 (was 5lb 7oz) stays on the 3 or 4 hourly feeding routine overnight so they feed separately at night also I am too sleepy to manage the wrangling involved in tandem feeding. If I feed them together at 7.30am, 10.30am, 1.30pm, 4.30pm, 7.30pm, 10.30pm and 11.30pm then DT1 goes to bed and sleeps till 6 and DT2 slept 5 hours last night but normally wakes at around 2am and 5am, then DH does breakfast for the older DCs and I can get DD's lunch in between the 10.30 and 1.30 feeds. I can feed the older DCs at 6pm and then DH can make dinner for us in the evening.
Rambling post but yeah, routine is helping me. Homestart is a good suggestion, they'll normally come and entertain the older one for a couple of hours a week but it might not be as difficult as your friend is worrying it will be.