I honestly wouldn't go crazy stressing in elementary school. If she is 100% on state tests she would likely not be challenged enough in most elementary schools even if they are great. In middle school next year there should be options for advancement- for example, doing pre-algebra in 6th and then algebra in 7th and geometry in 8th. If it's a small town and they don't offer that then you can push to let her go to the high school for some classes if she is really not being challenged. Does your district offer any gifted programming?
Middle and high school will have options such as advanced and AP in high school. If you are happy where you live except for that, I would just keep on keeping on and follow her interests in terms of academics. Maybe see if there are some odyssey of the mind or STEM or junior achievement programs nearby. That sort of thing.
M, mommy to A 2005, E 2007, and L 2010