Thanks guys! We didn't go. We went to story time at Barnes & Noble and I bought her a new book.
xmiyux - That's sweet - I think Livi would like Echo :)
Excellent that the book bribe works! We totally resort to bribery on some things but don't ever feel too guilty since the bribe is always a book from Borders.
Children's parties though are pretty much sheer hell so any opportunity to avoid them should be embraced.
edit: And I'm sure our girls would get along well as long as your little one was alright playing pretend, cooking, and art. That is pretty much all Echo does. For Christmas we stocked her up with a ton of art supplies and cleared out a room that is her studio. So now she makes pictures, tells stories about the pictures, and basically is working on covering every inch of our house floor with cast off glitter.