A 29-day-old girl was referred to a dermatology practice by a general pediatrics clinic after having been evaluated in the emergency department for a scattered erythematous eruption on her scalp, face, neck, legs, and abdomen for 4 days. A punch biopsy revealed atrophic epidermis and interface dermatitis with positive staining for mucin, suggesting a diagnosis of neonatal lupus erythematosus. The infant's mother was subsequently. referred to a rheumatologist, where she received an autoimmune diagnosis. Based on this information, what diagnosis do you think the patient's mother received?