Well, she's 2 1/2 and Ben is [barely] two days old, so the verdict is probably should still be out. But so far so good.
She likes to hold him. In fact, the first time she met him, she wasn't sure she wanted to give him up, even to Gran-Gran. We convinced her by saying she could sit right next to them. And she likes to know where he is and what he's doing. Although the options for either are fairly limited, she asks anyway. She has already gotten me things [a blanket and burp cloth] and has helped feed him a couple of times.
Here's to hoping she continues to like holding and helping her brother, even if she's clinching a bag of My Little Ponies and plastic bracelets in the other hand.
There are more pictures here.