elizabethmom,
I didn't mention this in my previous post, partly because I feel as though I plug this site on every math-related thread (!), but if you are wanting a more formal delve into math, you could have a look at the free materials here at the University of Plymouth's site:
www.cimt.plymouth.ac.uk/projects/mep/default.htmSome of the workbooks are password-protected, but they have historically been generous about sharing the password with homeschoolers.
My boys enjoy these a lot, as the questions are very creative, and approach any given topic from several different angles--I think you'd find some potential for lateral thinking coming into play here. There are materials available from Year 1 to GCSE level (A-level stuff is still to come), so lots of scope for exploration. There is the option of using years 3, 4, and 5 interactively online; the rest are only printable.
Particular hits with Harpo have been the year 7 logic materials, the geometry chapters from various years, and the code resources developed in concert with the folks at Bletchley Park.
This may not appeal to your daughter or to you, but the price is right if you want to give it a flyer.
peace
minnie