kelp supplements will help your daughter. kelp has all of the necessary minerals people need, in a plant based form. take LOTS of kelp with lemon juice. the lemon juice makes the kelp more bioavailalbe. lots of fresh greens as already noted will do a lot of good.
if i were here i would get a juicer and drink lots of fresh made juice every single day. a juice fast would do her wonders. its during a fast that the body begins to break down things like bone spurs and other unwanted items.
if you take any kind of calcium or magnesium supplement, be sure to take some lemon juice or apple cider vinegar (raw unpastuerized) with it. the natural acids in the juice and vinegar chelate the minerals and make them more bioavailable.
black strap molasses is another good source of minerals.