Amy, I reread the library chapter. Following were the elements that I thought slowed it down:
- the descrition of the paintings of Behira, and about the Sixteen
- the part where Alda gives Tazar and Lewellen stuff to do that never really gets done, nor some hint that these were important tasks, rather than make-work
- the book of herbs
- finding the second copy of Tazar's book
I'm not suggesting getting rid of all of it, as there needs to be some effort on Alda's part looking for the book. Or maybe not, maybe she knows where it is, and she's simply hesitant to reveal that she's read it. Also, only you would know if some of that material is needed later in the story. I suggest getting an extra opinion or two before you cut anything.
Hope this helps.
Dirk
EDIT: Also, it's the kind of detail that Tolkien would have added, so you're in good company, but his setting descriptions of every part of the journey dragged, at least for me.