Abby Lee Miller May Never Walk Again Abby Lee Miller is undergoing chemotherapy treatmentbr for cancer. In April, Abby Lee Miller was diagnosed with non-Hodgkin’s lymphoma. This cancer develops in the lymphatic system. Abby is reportedly leaving rehab to go through more treatment. Source, to 'People' Miller is said to be getting stronger every day but is uncertain if she will ever walk again. The former 'Dance Moms' star has went under months of chemotherapybr and rehabilitation. Miller is keeping fans updated on her progress and keeping positive.