I would look at language arts materials from Michael Clay Thompson at www.rfwp.com
. My dd loved the rich language of the elementary level books and we really enjoyed reading and discussing them together. On the website is a link to a yahoo group for this curriculum for additional insight and help implementing it. To discuss books you read together, either read the book Deconstructing Penguins, or from the www.rfwp.com
site check out Suppose the Wolf were an Octupus books. They come with accompanying book lists and the site sells some as packages.
You might check out Charlotte Mason materials. The short but rich lessons, emphasis on nature studies might be a good fit. Take what works and leave the rest! Look for SecularCM on yahoo groups for a good group for ideas there.
You might look at the Pandia press site for science and history. However, I think the library and book ideas from the SecularCM group would give you all you really need. Google MSNucleus for free science curriculum online.
Math - we liked Singapore math and fun books like The Number Devil and Penrose the Mathematical Cat. When she's a little older, math books (like Challenge Math) by Zaccaro are good. For a good free math program, google MEP, it looks very good, K-12.
Art - Meet the Masters looks pretty good, but haven't tried it. It is on sale at the homeschoolbuyersco-op.com If you haven't checked out that site yet, do it. Good prices on lots of material, some secular, some not.
Hope this gives you some good ideas to get you started.