Thanks for the query.
I think taht you misunderstood something. Usually spleen
disorder is not related to calcium levels and only rarely the spleen can be cause of high ca. More commonly spleen is removed to hematologic or malignant diseases so they probably assume that there is some of these diseases. Spleen removal is not having some effect on calcium levels. She probably has enlarged spleen or hemolytica anemia
so consult your doctors again about indications for surgery
Wish you good health. Feel free to ask. Regards