You should get tested for a real disorder called "dyscalculia." It is in the same family as "dyslexia" but it affects how some people perceive mathematical concepts. It is highly under-diagnosed, and many children suffer years of frustration in school believing they are "stupid", and adults waste tons of money and energy attempting to re-learn math using regular teaching and learning methods when a different approach is what is needed.
You can master and learn math concepts with this disorder, but like other learning disabilities, you will need a special approach and therapies to achieve that goal. There are many programs that offer help.
You should know this condition can be hereditary also. So if your daughter is challenged, you might want her to get tested as well.
Here is information on the disorder:
http://www.as.wvu.edu/~scidis/dyscalcula.html
http://www.dyslexiaa2z.com/learning_difficulties/dyscalcu...
Here's a quick test online and other information on why testing is important. Regardless of your results, you should find an actual clinic to have bonifide testing done.
http://www.learning-aids.com/testing-dyscalculia
http://www.dyscalculia.me.uk/testing.html