Hey, Rico, scratch the ordering tests thing...they have a free online diagnostic test. You have to register first, and I haven't used them myself, but its worth checking out.
http://www.schooloftomorrow.com/Default.aspx#
Scroll about halfway down, under "Student Placement", and click on "Free Online Diagnostic Test."
Make sure your browser allows pop-ups for the website before you try it.
--Okay, I registered myself...it doesn't work very well in Firefox, but IE works fine. I had to register, close the box, then log in before it would allow me to choose a subject and grade level. I would start the test at 1st grade and let her go as far as she can. (That way she has a lot of right answers under her belt before she starts having difficulty with anything--it's a self-esteem thing.

)
If nothing else, Rico, you can observe the test, and jot down notes about which areas she seems to struggle with most, and then just help her with those areas. I would not help her with the test whatsoever. Anything she doesn't know the answer to or needs help discovering the answer to is material she needs to cover or review. Let her do it on her own, and be a silent (but interested) observer.
I recommend
www.funbrain.com. There are math games kids can play according to their grade level. Some of the "arcade" games require quick estimating and basic conceptual skills. My girls never suspected a thing. LOL!
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Link to the Math Arcade at FunBrain