Continuation of Calcium tablets for pain

Hi! In 2016, my aunt was diagnosed and treated for cancer in her tongue. The procedure resulted in her being able to consume only liquid diet - mostly milk based, since then. She has been taking her medicines sincerely. Around last year, she developed pain in her bones, and a doctor prescribed calcium supplement - ShelCal-HD - which helped suppress the pain to some degree. However recently we were informed that excessive intake of calcium, can result in stones, and since the pain was no longer there, she discontinued the supplement. However, the pain has revived since then. Should we resume the calcium supplement? What should be right dosage and frequency? She consumes milk very regularly as a base for almost all her food (her food is always liquid) and is tolerant to milk.