First tip: DO NOT LISTEN TO NEGATIVE HCPs!
In the first few days she should work on her latch with them individually!
Then she should tandem feed (to be sure that she puts the twin that is fussing on FIRST). If she tandem feeds she'll get more sleep.
TOP TIP! (that one of my twin clients gave to my latest twin antenatal group): Set short goals. Her plan was to breastfeed for 3 MONTHS! She found that thinking about it long term in the beginning caused her to stress. So... the first 3 weeks meant that she was half way to half way. Then she continued for another 3 weeks and was half way to her goal. Then another 3 weeks and she was almost there. At 3 months she felt wonderful and continues to exclusively breastfeed!
Make sure that her freezer is full of food. She won't have much energy for cooking etc in the first few weeks.
Keep large bottles of water at hand. Remember the thirst? Increases with twins!
She should BABYMOON. I know I say it all the time but to bf twins she really really does need to do it and to go back to bed as much as she can.
She should get a breastfeeding pillow. Either a nice cheap V shaped one or something like the Eazy 2 Nurse. I only ever recommend pillows to twin mums.
She should keep her visitors to a bare minimum in the very early days. It will take a while for her to get to grips with the sheer relentlessness of breastfeeding, but SHE WILL COME TO TERMS with it and it will work well.
You know all there is to know about breastfeeding. It doesn't change for twins. Same rules etc apply. Her and her DH MUST MUST MUST rest as much as they can in the beginning.
I've CATed you so if you need my number etc... it's your!
I exclusively bf mine for 18 months (stopped when I wanted to. Could have gone on for years).