S.D.
Read to her as much as possible. She'll learn more by playing with you and listening to you talk. She doesn't need special toys. She's better off with "open-function" toys that she can use for anything instead of a toy that specifically do one thing. And I know it can be a head ache, but banging on things is great fun. And playing with cups! Really, the best way to keep her stimulated and "learning to her full potential" is to be a parent, not leave her with toys to play with :)