Hi.. Her present severe pain may be due to the infection.. Low calcium with osteomalacia is acceptable is elderly females, however the pain can be worsened by infection.. You would need analgesics for pain relief and equally important is that she has enough bed rest.. Working and exertion can only worsen the situation.. Once her infection is improved she would feel much better, but include the dietary changes to improve the calcium then.. Use calcium supplements which are available in the stores alternatively.. Feel free to contact the specialist available online who will be able to provide you with more specific form of treatment through the specialist opinion service..