Defintley if you live in minnesota you will have low vitamin D!!!! i like in Minnesota also, and i have low vitamin D which is very common here. Make sure she drinks lots of orange juice and other things that are high in vitamin D, something my mom does is gives us vitamin D gummy things(they are like gummy bears but vitamin D bears) to make sure we get enough vitamin D, and we drink lots of orange juice and then on nice days we try to get out as much as possible, which can be hard in between school and it getting dark early! But if your daugther doesnt like those big pills look for the gummy kinds, they taste good and you dont have to swallow them!!!
16 years old, i also live in MN