You are very welcome! I love sharing my experience with my twins! It is very challenging, but it's also the most rewarding thing I have ever done.
You know, getting ANYONE to listen to anothers advice is a very difficult thing to do. Most people only do things they originate for themselves. You know the old saying you can lead a horse to water...blah blah blah. And breastfeeding is a very touchy topic for a lot of women.
On the positive side, she will bond with her baby, it just may take longer. Since she is your sister, I' am sure you will probably be the first to be able to talk to her about her decisions. Those things ALWAYS come up. Someday she will need a break and she will ask for help. And you will be prepared. Until then, all you can do is be there if she needs you. It sounds like you are already are!