My MIL got me the La Leche League book. What do you all think about that? The nice thing is it mentions all kinds of other AP things too.
I had the K'tan with my first baby, then got a Sleeping Baby Productions ring sling for the second.
Is there a Babywearing group local to her? If so, maybe a membership to that?? That way she can try/borrow all kinds of carrier and have help with them too.