Yes! If you have a book that is on someone's Wish List, then all you need to do to offer that book directly to that member (and NOT to the first person on the Wish List) is to go to the member's Wish List and click the button there to Post the book as a direct offer to that person. Be sure the ISBN on your book matches the ISBN on her Wish List!
If you are enrolled in Standard Annual Membership, you'll have the Friends Direct feature enabled on your account, which will let you offer the book to a Friend easily, right from the Post Books screen.
To use Friends Direct:
To offer the book via the Wish List:
To get to a member's Wish List - use the button on your Friends List or on her Forum Post or click her name in a Personal Message or on a transaction in your Transaction Archive, to go to her Profile or Bookshelf (both of which have a link to her Wish List). Or, if you are a Standard member and the other member is on your Friends list, you will be shown her name when you post the book and can choose to post directly to her (or any other wishing Friend) that way.
Please note:
If you have trouble with this (if the book is offered to/requested by someone other than your friend after you post it), these are the possibiities:
Related Links:
What is the Wish List?
How the Wish List Works
Posting and Sending a Wish Listed book
I have a book on the Club Wish List. Can I contact the wisher?
I have a book on the Club Wish List but it doesn't have an ISBN
My book's on the Club Wish List, with a different/no ISBN
How the Vacation/Hold feature works
How does the Vacation Hold affect My Bookshelf?
How does the Vacation Hold affect My Wish List?