Her last published book (2007) was
The Cat who had 60 Whiskers and unfortunately I found it a poor read with a scattered plot (though I think she was trying to mix things up, send Quill in a slightly different direction), and I wound up giving it back to our library sale room unscanned. Someone (her editor) should have made a special effort to make it amazing, since she was obviously in poor health and it could (and was) her last work