My mother has lived with myeloma for two years, but involuntary movements persist. she stopped taking the conflicting chemo pill months ago. need help?

Your doctor can help: I do not fully understand your question. The involuntary movements are not related to your mother's myeloma problem. So ask your doctor to help her. She may need help from a neurologist for her movement disorder while the oncologist can help with controlling her myeloma, for which we have many good medicines which could help her.